Seiko Credor 6870 User manual

2L series (2L75)
4L series (4L75)
4S series (4S71・4S76・4S77・4S79)
6L series (6L75)
6S series (6S37・6S74・6S77・6S78・6S96・6S99)
68 series (6870・6890・6898・6899)
8L series (8L36・8L75)
BGJCCO1-2301

Thank you very much for choosing a CREDOR watch.
Only the unique melding of traditional Japanese sensitivity and state-of-
the-art technology can bring you a watch of this quality and character.
Doing so is our passion. The CREDOR name is your guarantee.
From the French “crête d’or” or “crest of gold” it signifies our commitment
to always being the very best.
We hope this CREDOR watch will be your favorite personal timepiece for
many years to come.
Please read carefully the instructions in this booklet for proper and safe use
of your CREDOR watch before start using it.
Keep this manual handy for easy reference.
If your watch has a protective film for preventing scratches, make sure to peel it off before using
the watch. If the watch is used with the film on it, dirt, sweat, dust, or moisture may be attached
to the film and may cause rust.
1
English

CONTENTS
■ HANDLING CAUTIONS ....................................................................................... 3
■ PERFORMANCE AND TYPE ............................................................................... 4
■ WATER RESISTANT PERFORMANCE .............................................................. 4
■ CAUTIONS ON WATER RESISTANCE .............................................................. 5
■ CHARACTERISTICS ........................................................................................... 6
■ NAMES OF THE PARTS ...................................................................................... 6
■ HOW TO USE ..................................................................................................... 12
• Crown .............................................................................................................. 12
• How to wind the mainspring ............................................................................ 13
• Power reserve indicator ................................................................................... 13
• How to use (For models without a seconds hand) ........................................... 14
• How to use (For models with a seconds hand or a small seconds hand) ........ 15
• How to use (For models with the date) ............................................................ 16
• How to use (For models with the date, day of the week, and a 24-hour hand)
....... 18
• How to use (For models with the date and a 24-hour hand) ............................ 22
※List of time zone differences in major regions of the world ........................... 26
• How to use the chronograph (6S series) ......................................................... 27
■ TO PRESERVE THE QUALITY OF YOUR WATCH .......................................... 31
• After-sale service ............................................................................................. 31
• Daily care ........................................................................................................ 32
• Remarks on 18-karat gold ............................................................................... 32
• Watch body / metal bracelet ............................................................................ 32
• Band ................................................................................................................ 33
• How to use an adjustable three-fold clasp ....................................................... 34
• Magnetic resistance (Magnetic influence) ....................................................... 35
• Lumibrite ......................................................................................................... 36
• Troubleshooting .............................................................................................. 37
■ SPECIFICATIONS (Movement) ........................................................................ 38
2
■ HANDLING CAUTIONS
bWARNING
To indicate the risks of serious consequences such as severe injuries
unless the following safety regulations are strictly observed.
Immediately stop wearing the watch in the following cases.
○
If the watch body or band becomes edged by corrosion etc.
○
If the pins protrude from the band.
* Immediately consult the retailer from whom the watch was purchased or SEIKO CUSTOMER
SERVICE CENTER.
Keep the watch and accessories out of the reach of babies
and children.
Care should be taken to prevent a baby or a child accidentally swallowing the accessories.
If a baby or child swallows the battery or accessories, immediately consult a doctor, as it will be
harmful to the health of the baby or child.
bCAUTION
To indicate the risks of light injuries or material damages unless the
following safety regulations are strictly observed.
Avoid wearing or storing the watch in the following places.
○
Places where volatile agents (cosmetics such as polish remover, bug repellent, thinners, etc.)
are vaporizing
○
Places where the temperature drops below 5°C
or rises above 35°C for a long time
○
Places affected by strong magnetism or
static electricity
○
Places affected by strong vibrations
○
Places of high humidity
○
Dusty places
If you observe any allergic symptoms or skin irritation
Stop wearing the watch immediately and consult a specialist such as a dermatologist or an
allergist.
Other cautions
○
Do not disassemble or tamper with the watch.
○
Please follow local government directions when disposing of the watch body.
○
Keep the watch out of the reach of babies and children. Extra care should be taken to avoid
risks of any injury or allergic rash or itching that may be caused when they touch the watch.
○
If your watch is of the fob or pendant type, the strap or chain attached to the watch may damage
your clothes, or injure the hand, neck, or other parts of your body.
○
Please keep in mind that if a watch is taken off and placed down as it is, the case back, the band
and the clasp will rub against each other possibly causing scratches on the case back. We
recommend placing a soft cloth between the case back, the band and the clasp after taking off
your watch.
3
HANDLING CAUTIONS
English

■ PERFORMANCE AND TYPE
The case back shows the performance and type of your watch.
6
8
9
0
-
0
0
0
0
W
A
T
E
R
R
E
S
I
S
T
A
N
T
1
0
B
A
R
M
A
D
E
I
N
J
A
P
A
N
0
0
0
0
0
0
1
8
K
T
6890-0000 :
WATER RESISTANT 10BAR :
Water resistant performance
Serial number
Case Number
Caliber Number
○Water resistant performance
Please refer to P. 4.
○Case number
The number to identify the type of your watch
○Serial number
The number to identify your watch
* The above illustrations are examples and may differ from the case back of the watch you
purchased.
■ WATER RESISTANT PERFORMANCE
Refer to the table below for the description of each degree of water resistant
performance of your watch before using.
Indication on the case back Water resistant performance Conditions of Use
No indication Non-water resistance Avoid drops of water or sweat
WATER RESISTANT Water resistance for everyday
life
The watch withstands
accidental contact with water in
everyday life
b
WARNING
Not suitable for swimming
WATER RESISTANT
5 BAR
Water resistance for everyday
life at 5 barometric pressures
The watch is suitable for
swimming.
WATER RESISTANT
10 (20) BAR
Water resistance for everyday
life at 10 (20) barometric
pressures
The watch is suitable for diving
not using an air cylinder.
4PERFORMANCE AND TYPE
■CAUTIONS ON WATER RESISTANCE
bWARNING
Do not use the watch in scuba diving or
saturation diving.
The various tightened inspections under simulated harsh environment,
which are usually required for watches designed for scuba diving or
saturation diving, have not been conducted. For diving, use watches
specifically designed for diving.
bCAUTION
Do not pour running water directly from
faucet.
The water pressure of tap water from a faucet is high enough to degrade
the water resistant performance of a water resistant watch for everyday life.
Do not turn or pull out the crown when the
watch is wet.
Water may get inside of the watch.
* If the inner surface of the glass is clouded with condensation or water
droplets appear inside of the watch for a long time, the water resistant
performance of the watch is deteriorated.
Immediately consult the retailer from whom the watch was purchased or
SEIKO CUSTOMER SERVICE CENTER.
Do not leave moisture, sweat and dirt on the
watch for a long time.
Be aware of a risk that a water resistant watch may lessen its water resistant
performance because of deterioration of the adhesive on the glass or
gasket, or the development of rust on stainless steel.
Do not wear the watch while taking a bath or
a sauna.
Steam, soap or some components of a hot spring may accelerate the
deterioration of water resistant performance of the watch.
5
CAUTIONS ON WATER RESISTANCE
English

■ CHARACTERISTICS
○ This watch is a mechanical watch that runs by a mainspring.
○ Before using the watch, turn the crown by hand about 20 times to wind up the mainspring
of the watch.
○ While the loss / gain of a quartz watch is shown by the monthly or yearly rate, the loss /
gain of a mechanical watch is shown by the daily rate (loss/gain per one day).
○ The loss / gain of a mechanical watch changes delicately day by day, depending on various
environment or conditions in which the watch is used (such as temperatures, the amount
of time the watch has been worn, the amount of arm movement, and the amount that the
mainspring is wound up).
○ A mechanical watch may lose / gain time when it is affected by strong magnetism. If the
parts of the watch become magnetized, the watch needs repair including demagnetizing.
In this case, consult the retailer from whom the watch was purchased.
■ NAMES OF THE PARTS
Please check the caliber number of your watch before reading each operating instruction.
The caliber number can be checked on the case back of your watch. “PERFORMANCE AND
TYPE”→ P. 4
* The caliber number identifies your watch type.
* The orientation and design of the display may vary depending on the model.
6870, 6890, 6899
Manual winding type
with one of the world’s thinnest movements (1.98 mm)
1Hour hand
2Minute hand
3Crown
→ P. 12
2
3
1
How to wind the mainspring→ P. 13
How to use (For models without a seconds hand)→ P. 14
6CHARACTERISTICS
6898
Manual winding type
with one of the world’s thinnest movements (1.98 mm)
1Hour hand
2Small seconds hand
3Minute hand
4Crown
→ P. 12
4S71
Automatic winding type (with manual winding function)
1Hour hand
2Seconds hand
3Minute hand
4Crown
→ P. 12
3
4
1
2
How to wind the mainspring→ P. 13
How to use (For models with a seconds hand or a small seconds hand)→ P. 15
3
4
1
2
How to wind the mainspring→ P. 13
How to use (For models with a seconds hand or a small seconds hand)→ P. 15
7
NAMES OF THE PARTS
English

2L75, 4L75, 6L75, 8L75
Automatic winding type (with manual winding function)
with a date display
1Hour hand
2Seconds hand
3Minute hand
4Date
5Crown
→ P. 12
4S76
Automatic winding type (with manual winding function)
with a retrograde-type day hand, time zone adjustment, power reserve indicator, 24-hour hand
and date display
1Hour hand
2Power reserve indicator
→ P. 13
3Seconds hand
4Date hand
5Minute hand
62-o’clock crown
73-o’clock crown
→ P. 12
8Day hand
924-hour hand
6
3
4
5
1
2
How to wind the mainspring→ P. 13
How to use (For models with the date)→ P. 16
5
8
9
7
6
1
3
4
2
How to wind the mainspring→ P. 13
How to use (For models with the date, day of the week, and a 24-hour hand)→ P. 18
8NAMES OF THE PARTS
4S77
Automatic winding type (with manual winding function)
with a retrograde-type day hand, time zone adjustment, 24-hour hand and date display
1Hour hand
224-hour hand
3Seconds hand
4Date hand
5Minute hand
62-o’clock crown
73-o’clock crown
→ P. 12
8Day hand
4S79
Manual winding type
with a power reserve indicator
1Hour hand
2Power reserve indicator
→ P. 13
3Small seconds hand
4Minute hand
5Crown
→ P. 12
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5
8
7
6
1
3
4
2
How to wind the mainspring→ P. 13
How to use (For models with the date, day of the week, and a 24-hour hand)→ P. 18
40
30
20
10
0
60
30
40
20
50
30
4
5
1
2
3
How to wind the mainspring→ P. 13
How to use (For models with a seconds hand or a small seconds hand)→ P. 15
9
NAMES OF THE PARTS
English

8L36
Automatic winding type (with manual winding function)
with time zone adjustment, 24-hour hand and date display
1Hour hand
2Seconds hand
3Date
4Minute hand
5Crown
→ P. 12
624-hour hand
6S37, 6S77
Automatic winding type (with manual winding function)
with a power reserve indicator, a chronograph movement and date display
1Center chronograph seconds
hand
2Hour hand
3Small seconds hand
4Chronograph hour hand
5Date
6Chronograph minute hand
7Minute hand
8START/STOP button
9Crown
→ P. 12
0Power reserve indicator
→ P. 13
aRESET button
4
6
5
1
2
3
How to wind the mainspring→ P. 13
How to use (For models with the date and a 24-hour hand)→ P. 22
60
30
40
20
50
30
30
15
20
10
25
5
40
30
20
10
0
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‥ 󰿉
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‧
6
6
7
0
9
8
a
2
1
4
5
3
How to wind the mainspring→ P. 13
How to use (For models with the date)→ P. 16
How to use the chronograph (6S series)→ P. 27
10 NAMES OF THE PARTS
6S78
Automatic winding type (with manual winding function)
with a chronograph movement and date display
1Center chronograph seconds
hand
2Hour hand
3Small seconds hand
4Chronograph hour hand
5Chronograph minute hand
6Minute hand
7START/STOP button
8Date
9Crown
→ P. 12
0RESET button
6S74, 6S96, 6S99
6S74, 6S99: Manual winding type, 6S96: Automatic winding type (with manual winding
function)
with a power reserve indicator, a chronograph movement
1Center chronograph seconds
hand
2Hour hand
3Small seconds hand
4Chronograph hour hand
5Chronograph minute hand
6Minute hand
7START/STOP button
8Crown
→ P. 12
9Power reserve indicator
→ P. 13
0RESET button
60
30
40
20
50
30
30
15
20
10
25
5
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‣‣
‣•
󰿉
‣
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․
󰿋
‥ 󰿉
…
‧
6
2
1
4
3
5
6
8
9
7
0
How to wind the mainspring→ P. 13
How to use (For models with the date)→ P. 16
How to use the chronograph (6S series)→ P. 27
60
30
40
20
50
30
30
15
20
10
25
5
40
30
20
10
0
‣․
‣‣
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󰿊
․
󰿋
‥ 󰿉
…
‧
2
1
4
3
5
6
8
7
0
9
How to wind the mainspring→ P. 13
How to use (For models with a seconds hand or a small seconds hand)→ P. 15
How to use the chronograph (6S series)→ P. 27
11
NAMES OF THE PARTS
English

■ HOW TO USE
Crown
There are two types of crowns, the regular one and one that can be locked.
Please confirm the crown of the watch that you are using.
While
pressing the
crown in, turn it
in the direction
indicated by
the arrow.
The
crown
turns.
The crown
does not
turn.
Normal crown
Pull out the crown and operate it.
Screw down crown
Unlock the crown
before operating it.
After operating the
crown, lock it.
Unscrew
Rotate while
pressing
the crown in.
* By locking the crown by screw, a
screw down crown can prevent
malfunction and increase water
resistance.
* Be careful not to screw the crown
in by force as it may damage the
slots of the crown.
* Turn the crown from time to time. → P. 32
12 HOW TO USE
How to wind the mainspring
Manual winding type (the procedure below is the same
when you wind up an automatic winding type by hand)
1Do not pull the crown out.
(If the watch is equipped with the screw down crown, unscrew the crown before pulling it
out.)
* When the mainspring approaches full-winding, turning of the crown is heavy more or
less, however, this is caused by reaction force of the wound mainspring, which is not
defective.
* It is structured so that the crown can be further turned in the full-winding state. Although
it is not necessary to worry about cutting the mainspring, refrain from excessive turning.
(2L, 4S, 6L, 6S, 4L and 8L series)
3Please wind the mainspring fully everyday at a fixed time to keep the watch moving
accurately.
bCAUTION
In case of 68 series watches that have thin movement, it becomes harder to turn the crown
when the mainspring is fully wound up.
Be careful not to keep turning the crown forcibly. Otherwise the mainspring may be cut.
2Slowly turn the crown clockwise to
wind the mainspring.
Automatic winding type (with manual winding function)
○ The mainspring can be sufficiently wound automatically by natural movement of the arm
while normally worn on the wrist. In addition, it can be wound by turning the crown.
○ A stopped watch can be started by arm movement when it is worn on the wrist, however,
before wearing the watch, wind the mainspring sufficiently and adjust the time and date.
* It is recommended that you wear the watch on your wrist more than 10 hours a day to keep
the mainspring wound up. If the mainspring is not wound up sufficiently, the watch may
lose or gain time. If you use the watch without wearing on your wrist, wind the mainspring
up sufficiently by turning the crown by hand every day at a fixed time.
Power reserve indicator
The power reserve indicator lets you know the winding state of the mainspring.
Before removing the watch from your wrist, observe the power reserve indicator to check if
the watch has stored enough power to keep running until the next time you wear it. If
necessary, wind the mainspring.
(To prevent the watch from stopping, wind the mainspring to store the excess power that will
allow the watch to run for extra time.)
13
HOW TO USE
How to wind the mainspring
English

How to use (For models without a seconds hand)
Models: 6870, 6890, 6899
How to set the time
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
bCAUTION
Due to its gear train mechanism, for setting the time of the mechanical watch correctly, the
hands should be set back once slightly and then set forward to the correct time.
2Pull out the crown.
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
* If the watch is a 68 series model,
it continues to move when the
crown is pulled out.
3Turn the crown to set the hour and
minute hands to the time.
4Push the crown back in to its normal
position.
(If the crown of your watch is a
screw lock type, lock the crown.)
14 HOW TO USE
How to use (For models without a seconds hand)
How to use (For models with a seconds hand or
a small seconds hand)
Models: 6898, 4S71, 4S79, 6S74, 6S96, 6S99
How to set the time
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
bCAUTION
Due to its gear train mechanism, for setting the time of the mechanical watch correctly, the
hands should be set back once slightly and then set forward to the correct time.
2Pull out the crown when the seconds
hand (or the small seconds hand) is
at the 12 o’clock position. (The
seconds hand or the small seconds
hand will stop.)
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
* If the watch is a 6898 model, the
small seconds hand continues to
move when the crown is pulled
out.
3Turn the crown to set the hour and
minute hands to the time.
4Push the crown back into the normal
position in accordance with a time
signal.
(If the crown of your watch is a
screw lock type, lock the crown.)
15
HOW TO USE
How to use (For models with a seconds hand or a small seconds hand)
English

How to use (For models with the date)
Models: 2L75, 4L75, 6L75, 8L75, 6S37, 6S77, 6S78
bCAUTION
Do not amend the date when the watch is displaying between 8:00 p.m. and 2:00 a.m.
If the date is set during this period of time, the date may not change when the next day comes,
or this may cause damage.
How to set the time and date
This watch is equipped with the date display function. The date changes once every 24 hours
at around midnight.
Therefore, if the a.m./p.m. is incorrectly set, the date will change around 12:00 p.m.
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
5
5
2Pull out the crown to the first click.
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
3The date can be adjusted by turning
the crown clockwise (12 o’clock
direction).
First turn the crown clockwise until
the previous day’s date from the
desired date appears.
【Ex.】If you want to set the date
to “6,” set the date to “5”
by turning the crown
clockwise.
16 HOW TO USE
How to use (For models with the date)
6
6
4Pull out the crown to the second
click. Pull out the crown when the
seconds hand (or the small seconds
hand) is at the 12 o’clock position.
(The seconds hand or the small
seconds hand will stop.)
Turn the crown clockwise until the
desired date appears. The time is
now set for the a.m. period. Further
turn the crown to set the current
time
5Push the crown back into the normal
position in accordance with a time
signal. The watch starts operating.
(If the crown of your watch is a
screw lock type, lock the crown.)
bCAUTION
Due to its gear train mechanism, for setting the time of the mechanical watch correctly, the
hands should be set back once slightly and then set forward to the correct time.
Date adjustment at the end of the month
It is necessary to adjust the date after February (which has 28 days, 29 days in a leap year)
and a 30 day month.
【Ex.】To adjust the date in the a.m. period on the first day of a month following a 30-day
month
On the first day, “31” is displayed. Pull out
the crown to the first click. Turn the crown
clockwise (12 o’clock direction) to set the
date to “1”, and push the crown back in to
the normal position. 1
bCAUTION
○ For models with a screw down crown, remember to screw the crown in.
○ Do not amend the date when the watch is displaying between 8:00 p.m. and 2:00 a.m.
Doing so may cause damage.
17
HOW TO USE
How to use (For models with the date)
English

How to use (For models with the date, day of the
week, and a 24-hour hand)
Models: 4S76, 4S77
bCAUTION
Do not adjust the date and day when the time the watch indicates between 9:30 p.m. and
2:30 a.m.
Amending the date or the day of the week during this time period may cause problems such
as the date or the day of the week failing to change the next day or may cause damage.
How to set the time, date and day
This watch is equipped with a date and day of the week display function. The date and day
of the week change once every 24 hours.
The date changes around midnight, and the day of the week changes at around 2:30 a.m. If
the a.m./p.m. is incorrectly set, the date will change at 12 o’clock noon, and the day of the
week will change at around 2:30 p.m.
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
4Push the 3 o’clock position crown back to its normal position.
* If the hour hand is not aligned with the 12 o’clock position, go to step 5.
If the hour hand is aligned with the 12 o’clock position, proceed to step 8.
2Pull out the 3 o’clock position crown
to the second click.
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
3Turn the 3 o’clock position crown to
set the 24-hour hand and the minute
hand to the 12 o’clock position.
18 HOW TO USE
How to use (For models with the date, day of the week, and a 24-hour hand)
7Push the 2 o’clock position crown back to its normal position.
Set the day of
the week
Set the date
* When the day is adjusted by turning the crown clockwise, the mainspring is also wound.
This makes turning the crown a little heavy but this is not a malfunction.
5Pull out the 2 o’clock position crown
to the first click.
6Turn the 2 o’clock position crown to
set the hour hand to the 12 o’clock
position.
* The crown can be turned either
clockwise or counterclockwise
without any problem.
8Pull out the 3 o’clock position crown
to the first click.
9Turn the 3 o’clock position crown
until the previous day’s date and day
of the week from the desired date
appears.
【Ex.】If you want to set the date
to “6,” set the date to “5”
by turning the crown
clockwise.
Turn the crown counterclockwise
(6 o’clock direction) to set the
date, and turn the crown
clockwise (12 o’clock direction) to
set the day of the week.
19
HOW TO USE
How to use (For models with the date, day of the week, and a 24-hour hand)
English

aPush the crown back in to the normal position in accordance with a time signal. The watch
starts operating.
(If the crown of your watch is a screw lock type, lock the crown.)
0Pull out the 3 o’clock position crown
to the second click. Pull out the
crown when the seconds hand is at
the 12 o’clock position. (The
seconds hand will stop.)
Turn the 3 o’clock position crown
until the desired date and day
appears. When the date and day
changes, the time is a.m. Further
turn the crown to set the current
time.
bCAUTION
○Due to its gear train mechanism, for setting the time of the mechanical watch correctly, the
hands should be set back once slightly and then set forward to the correct time.
○Do not turn the minute hand counterclockwise at and around 1:00 a.m. while the date hand
is showing“ Monday”. Otherwise, the hour hand may turn free.
If the minute hand is turned clockwise to set the time around 1:00 a.m., the hour hand will
not turn free.
Date adjustment at the end of the month
It is necessary to adjust the date after February (which has 28 days, 29 days in a leap year)
and a 30 day month.
【Ex.】To adjust the date in the a.m. period on the first day of a month following a 30-day
month
On the first day, “31” is displayed. Pull out
the crown to the first click. Turn the crown
counterclockwise (6 o’clock direction) to
set the date to “1,” and push the crown back
into the normal position.
bCAUTION
○ For models with a screw down crown, remember to screw the crown in.
○Do not adjust the date when the time the watch indicates between 9:30 p.m. and 2:30 a.m.
Doing so may cause damage.
20 HOW TO USE
How to use (For models with the date, day of the week, and a 24-hour hand)
Time difference adjustment function
This caliber is equipped with a “time zone adjustment mechanism.” By using the 2 o’clock
position crown, the hour hand can be independently adjusted in one-hour increments.
This eliminates the trouble of stopping the watch to adjust the time when you travel abroad.
In addition, by using the 24-hour hand (GMT hand) at the center of the watch, the watch can
be used as a dual time watch that shows home time and local time.
How to use the time difference adjustment function
3On completing the adjustment of the 24-hour hand, push the 2 o’clock position crown back
to its normal position.
* After the hour hand has been adjusted to the local time, the 24-hour hand still shows
the original time (home time), allowing the watch to be used as a dual time indicator.
bCAUTION
When adjusting the time zone using the 2 o’clock position crown, if the crown is turned with
the 3 o’clock position crown pulled to the second click (where hands can be turned), the
time zone adjustment mechanism may fail to work and the time zone may not be adjusted.
Therefore, ensure that the 3 o’clock position crown is pushed to its normal position when
adjusting the time zone.
1Check that the 3 o’clock position
crown is at its normal position. Then
pull out the 2 o’clock position crown
to the first click.
2Turn the 2 o’clock position crown to
set the time of your destination.
21
HOW TO USE
How to use (For models with the date, day of the week, and a 24-hour hand)
English

How to use (For models with the date and a 24-
hour hand)
Model: 8L36
How to set the time and date
This watch is equipped with the date display function. The date changes once every 24 hours
at around midnight.
Therefore, if the a.m./p.m. is incorrectly set, the date will change around 12:00 p.m.
To set the time and date, set the 24-hour hand and minute hand first, and then set the hour
hand and date.
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
4Push the crown back in simultaneously with the time signal.
* The setting of the 24-hour, minute and seconds hands is now completed.
2Pull out the crown to the second click
when the seconds hand is at the
12 o’clock position. (The seconds
hand stops.)
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
3Turn the crown clockwise to set the
24-hour and minute hands to the
current time of your area.
While doing so, set the minute hand
a few minutes behind the correct
time, and then slowly advance it to
the desired time.
* Only the 24-hour and minute
hands are to be set first. Even if
the hour hand is indicating
incorrect time, or the date may be
altered depending on the
position of the hour hand, it is not
necessary to make an
adjustment at this stage.
22 HOW TO USE
How to use (For models with the date and a 24-hour hand)
* The crown can be turned in either direction to set the date, however, it is recommended to
turn the crown in the direction which enables you to set the date with a smaller adjustment.
* Turn the crown slowly, checking that the hour hand moves in one-hour increments.
* When setting the hour hand, the other hands may move slightly. However, this is not a
malfunction.
* If you set the date between 10 p.m. and 0 a.m. by turning the hour hand counterclockwise,
turn the hour hand until it shows sometime between 9 p.m. and 10 p.m. once, then set the
date.
* In case the hour hand is turned counterclockwise, the date will be put back when the hour
hand shows around 10 p.m., however, it is not malfunction.
7Push the crown back in to complete the time setting.
(If the crown of your watch is a screw lock type, lock the crown.)
5To move on to the hour hand and
date setting, pull out the crown to the
first click.
6Turn the crown to set the hour hand.
While turning the crown, the moment
the date changes is midnight. When
setting the hour hand, be sure that
a.m./p.m. is set correctly.
Set the date also at this point if
necessary.
Date adjustment at the end of the month
It is necessary to adjust the date after February (which has 28 days, 29 days in a leap year)
and a 30 day month.
【Ex.】To adjust the date in the a.m. period on the first day of a month following a 30-day
month
On the first day, “31” is displayed. Pull out
the crown to the first click. Turn the crown
clockwise (12 o’clock direction) to set the
date to “1”, and push the crown back in to
the normal position.
bCAUTION
For models with a screw down crown, remember to screw the crown in.
23
HOW TO USE
How to use (For models with the date and a 24-hour hand)
English

How to use the 24-hour hand
This watch has two different types of 24-hour hand usage.
When you use as a dual time indicator, set the 24-hour and hour hands to different times.
<Type 1> : 24-hour hand as an
a.m./p.m. indicator
Simply using the 24-hour hand to show the
24-hour time as an a.m./p.m. indicator. (This
is the standard usage type for the 24-hour
hand.)
Both the hour hand and the 24-hour hand are
indicating the Japan time 10:00 a.m.
<Type 2> : 24-hour hand as a dual
time indicator
Using the time difference adjustment
function, set the 24-hour hand to indicate a
time different from the time that the hour and
minute hand indicate, which is of a place in
a different time zone area with at least one
hour of time difference from where you are.
Hour hand : Japan time 10:00 a.m.
24-hour Hand : London time 1:00 a.m.
Time difference adjustment function
For example, while traveling abroad and staying in a place with a different time from where
you live, you can conveniently set the watch to indicate the local time in the different time
zone area without stopping the watch.
The hour hand indicates the time of the place where you currently are, while the 24-hour hand
indicates the time of the place of origin.
The date works in conjunction with the movement of the hour hand. If the time difference is
correctly adjusted, the watch displays the correct date of the place where you are staying.
How to use the time difference adjustment function
1Make sure that the watch is operating.
To carry out the procedure, please make sure that the watch is in working state.
Please wind the mainspring when the watch is not working.
“How to wind the mainspring”→ P. 13
2Pull out the crown to the first click.
(If the watch is equipped with the
screw down crown, unscrew the
crown before pulling it out.)
24 HOW TO USE
How to use (For models with the date and a 24-hour hand)
3Turn the crown to set the hour hand to indicate the time of the place where you are staying.
Make sure that a.m./p.m. and date are correctly set.
* The date is designed to work in conjunction with the movement of the hour hand,
therefore, incorrect setting of a.m./p.m. will cause the date to change at noon.
“List of time zone differences in major regions of the world”→ P. 26
Turning the crown
clockwise
(12 o’clock direction):
The hour hand is
advanced one hour.
Turning the crown
counterclockwise
(6 o’clock direction):
The hour hand is set
back one hour.
* The crown can be turned in either direction to set the date, however, it is recommended to
turn the crown in the direction which enables you to set the time difference with a smaller
adjustment.
* Turn the crown slowly, checking that the hour hand moves in one-hour increments.
* While turning the crown, the moment the date changes is midnight.
* When setting the hour hand, the other hands may move slightly. However, this is not a
malfunction.
* If you set the date between 10 p.m. and 0 a.m. by turning the hour hand counterclockwise,
turn the hour hand until it shows sometime between 9 p.m. and 10 p.m. once, then set the
date.
* In case the hour hand is turned counterclockwise, the date will be put back when the hour
hand shows around 10 p.m., however, it is not malfunction.
4Upon completion of setting, make sure that the time indicated is correct, and then push
the crown back in. The setting procedure is now completed.
(If the crown of your watch is a screw lock type, lock the crown.)
25
HOW TO USE
How to use (For models with the date and a 24-hour hand)
English

List of time zone differences in major regions of the world
* There are time zone differences based on time offsets from Universal Time Coordinated
(UTC), which has been internationally adopted. The world is divided into 24 time zones, and
neighboring time zones have a one-hour time difference, so that they correspond to the
rotation of the earth which makes one full rotation in 24 hours (1 day). In some regions of the
world, daylight saving time is individually observed.
* Daylight saving time, being defined as time difference +1 hour, is a system that advances the
time by 1 hour during summer time to prolong the daylight hours.
Names of the cities
Time difference
from Universal
Time Coordinated
(UTC)
Time difference
from Japan
Standard Time
(JST)
Other cities in the same
region
Tokyo +9 hours 0 hours Seoul, Pyongyang
Beijing +8 hours -1 hour Hong Kong, Singapore
Bangkok +7 hours -2 hours Jakarta
Dacca +6 hours -3 hours
Karachi +5 hours -4 hours
Dubai +4 hours -5 hours
Jeddah +3 hours -6 hours Baghdad
Cairo +2 hours -7 hours HAthens
HParis +1 hour -8 hours HRome, HBerlin
HLondon 0 hours -9 hours HLisbon
HAzores -1 hour -10 hours
Rio de Janeiro -3 hours -12 hours
Santo Domingo -4 hours -13 hours
HNew York -5 hours -14 hours HMontreal
HChicago -6 hours -15 hours HMexico City
HDenver -7 hours -16 hours
HLos Angeles -8 hours -17 hours HVancouver
HAnchorage -9 hours -18 hours
Honolulu -10 hours -19 hours
Midway Island -11 hours -20 hours
HWellington +12 hours +3 hours HAuckland
Nouméa +11 hours +2 hours
HSydney +10 hours +1 hour Guam
* Regions marked with Huse daylight saving time
* The time zone differences of each region and use of daylight saving time are based on data
as of January 2023. These are subject to change according to the governments of the
respective countries or regions.
26 HOW TO USE
How to use (For models with the date and a 24-hour hand)
How to use the chronograph (6S series)
A chronograph is a watch that has a stopwatch function in addition to a time
display function. This watch features a stopwatch function which can measure
time up to 12 hours in 1/8-second increments.
Before using the stopwatch function
1Make sure that the mainspring is sufficiently wound.
When using the stopwatch, ensure that the watch is working.
2Make sure that the center chronograph seconds hand is pointing at the 0 position.
If it is not pointing at the 0 position, press the RESET button.
* Do not pull out the crown while the stopwatch function is operating, as doing so will stop
the measurement.
Names of the chronograph parts and their function
1Center chronograph seconds hand
212-hour dial
Chronograph hour hand
330-minute dial
Chronograph minute hand
4START/STOP button
5RESET button
* The orientation and design of the display may vary depending on the model.
60
30
40
20
50
30
30
15
20
10
25
5
40
30
20
10
0
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‧
6
60
55
50
45
5
10
15
20
25
30
35
40
3
4
5
1
2
27
HOW TO USE
How to use the chronograph (6S series)
English

How to use the chronograph (stopwatch) function
Press the START/STOP button to begin measuring time.
Pressing START/STOP button repeatedly enables the chronograph to continue to count.
1Make sure that the mainspring is sufficiently wound and the watch is working.
60
30
40
20
50
30
30
15
20
10
25
5
40
30
20
10
0
‣․
‣‣
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󰿋
‥ 󰿉
…
‧
6
60
55
50
45
5
10
15
20
25
30
35
40
60
30
40
20
50
30
30
15
20
10
25
5
40
30
20
10
0
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․
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‥ 󰿉
…
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6
60
55
50
45
5
10
15
20
25
30
35
40
60
30
40
20
50
30
30
15
20
10
25
5
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30
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6
60
55
50
45
5
10
15
20
25
30
35
40
2Start measuring time.
Upon pressing of the START/STOP
button, the chronograph hands
start moving and the stopwatch
starts measuring time.
3Stop measuring time.
At the moment you want to finish the
measurement, press the START/
STOP button again to stop the
chronograph hands.
【Ex.】6 hours 20 minutes
10 seconds and 0
* The chronograph minute hand on
the 30-minute dial completes two
full rotations in an hour.
To read the 30-minute dial, see
the display of the 12-hour dial as
a rough indication.
4Reset the chronograph hands.
After stopping the chronograph
hands, press the RESET button to
return all the chronograph hands to
the 0 position.
28 HOW TO USE
How to use the chronograph (6S series)
How to use the tachymeter
The tachymeter can be used to measure average speed or productivity rate per unit time.
How to measure average speed of your vehicle
【Ex.】Measure the time taken by your vehicle to go one kilometer
1 km
How to compute productivity rate per hour
【Ex.】Measure the time required to produce one unit
1 unit
1When the car passes the start line,
press the START/STOP button to
start the stopwatch.
2When the car crosses the 1-
kilometer mark, press the START/
STOP button to stop the stopwatch.
Read the number on the tachymeter
scale to which the center stopwatch
seconds hand is pointing.
The measured result shows that the
average speed of the vehicle is 80
km/h.
1At the start of production, press the
START/STOP button to start the
stopwatch.
2When the production is completed,
press the START/STOP button to
stop the stopwatch. Read the
number on the tachymeter scale to
which the center stopwatch seconds
hand is pointing.
The measured result shows that the
average productivity rate is 300
units/h.
29
HOW TO USE
How to use the chronograph (6S series)
English

How to use the telemeter
The TELEMETER scale can be used to measure the distance of something (ex: lightning)
from the wearer of the watch by the amount of time it takes for a sound to travel.
【Ex.】These are the steps to measure the time from when lightning appeared to when the
sound reached the wearer.
The elapsed time
after a flash is seen
until thunder is heard
1Press the START/STOP button
when a flash of lightning appears to
start the stopwatch.
2When the thunder is heard, press the
START/STOP button to stop the
stopwatch, then read the number on
the telemeter at the position
indicated by the center stopwatch
seconds hand.
The measurement result shows
that it is 8km from the point where
the wearer is to the point where the
lightning struck.
30 HOW TO USE
How to use the chronograph (6S series)
■
TO PRESERVE THE QUALITY OF YOUR
WATCH
After-sale service
Notes on guarantee and repair
○Contact the retailer from whom the watch was purchased or SEIKO CUSTOMER SERVICE
CENTER for repair or overhaul.
○Within the guarantee period, present the certificate of guarantee to receive repair services.
○ Guarantee coverage is provided in the certificate of guarantee. Read carefully and retain
it.
○For repair services after the guarantee period has expired, if the functions of the watch can
be restored by repair work, we will undertake repair services upon request and payment.
Replacement parts
○ Please keep in mind that if original parts are not available, they may be replaced with
substitutes whose outward appearance may differ from the originals.
Inspection and adjustment by disassembly and
cleaning (overhaul)
○ Periodic inspection and adjustment by disassembly and cleaning (overhaul) is
recommended approximately once every 2 to 3 years in order to maintain optimal
performance of the watch for a long time.
○ The power transmission gear of the movement of this watch constantly receives force. To
ensure that this mechanism works properly all the time, washing parts, changing oil,
adjusting accuracy, checking functions and replacing consumable parts on a regular basis
are important. The first overhaul after the purchase of your watch is particularly important
for preserving long-time use of your watch. According to use conditions, the oil retaining
condition of your watch mechanical parts may deteriorate, abrasion of the parts may occur
due to contamination of oil, which may ultimately lead the watch itself to stop.
As the parts such as the gasket may deteriorate, water-resistant performance may be
impaired due to intrusion of perspiration and moisture.
Please contact the retailer from whom the watch was purchased for inspection and
adjustment by disassembly and cleaning (overhaul). For replacement of parts, please
specify “SEIKO GENUINE PARTS”. When asking for inspection and adjustment by
disassembly and cleaning (overhaul), make sure that the gasket and push pin are also
replaced with new ones.
○ When your watch is inspected and adjusted by disassembly and cleaning (overhauled),
the movement of your watch may be replaced.
31
TO PRESERVE THE QUALITY OF YOUR WATCH
English

Daily care
The watch requires good daily care
○ The watch body and band touch the skin directly just as underwear.
Keep the watch body and band clean in order to avoid stain on the sleeve edge or rash or
itch.
After removing the watch from your wrist, wipe perspiration or moisture with a soft cloth as
soon as possible.
○ Do not use any chemical agent such as cleaner to clean the watch.
Turn the crown from time to time. (Only several turns in
slow movement will be enough.)
○ This prevents corrosion of the crown and helps to extend the life of the gasket in use.
○ The same practice should be applied to a screw down crown. (No need to pull out the screw
down crown.)
“Crown”→ P. 12
○ Stainless steel is a highly rust-resistant metal. However, rust will form if contaminants are
left on it for a long time.
Remarks on 18-karat gold
○ 18-karat gold (18KT) is an alloy comprised of 75% of gold and 25% of other metals.
Depending on the proportion of the other metals mixed with the gold, the 18-karat gold is
classified into three colors such as yellow gold (YG), white gold (WG) and pink gold (PG).
Decoloration of 18-karat gold
○ While gold can maintain its glittering quality, other metal components in the alloy may
discolor to look like reddish or blackish due to various reasons.
○ Daily care helps to prevent discoloration of the alloy, however, if the discoloration or stain
of the alloy persists even after wiping the watch off, take your watch to the retailer from
whom the watch was purchased for refinishing. (Refinishing will be done at a cost.)
Watch body / metal bracelet
Length adjustment service
○ For the length adjustment service of the 18-karat gold or platinum bracelet, ask the retailer
from whom the watch was purchased.
The watch will be submitted to CREDOR SERVICE STUDIO for the length adjustment.
It may take two to three weeks depending on the model to adjust the length of the bracelet.
○
The length adjustment service of the 18-karat gold, platinum or stainless steel mesh bracelet
will not be charged only for the first time. However, the cost for materials or parts necessary
for the length adjustment and repair cost other than the length adjustment will be charged.
○ The length adjustment service of stainless-steel band is available from the retailer from
whom the watch was purchased or SEIKO CUSTOMER SERVICE CENTER. Some other
retailers may charge you for the length adjustment or may not undertake such treatments.
Periodic cleaning
○ Periodic cleaning is highly recommended to enjoy the best quality of the watch for a long
time.
Ask the retailer from whom the watch was purchased or the CREDOR SERVICE STUDIO
through your nearby CREDOR retailers. (Cleaning may be done at a cost.)
32 TO PRESERVE THE QUALITY OF YOUR WATCH
Band
The band touches the skin directly and becomes dirty from sweat or dust. Therefore,
lack of care may accelerate deterioration of the band or cause skin irritation or stain
on the sleeve edge. The watch requires a lot of attention for long usage.
Metallic band
○Moisture, sweat or soil will cause rust even on a stainless steel band if they are left for a
long time.
○Lack of care may cause a yellowish or gold stain on the lower sleeve edge of shirts.
○ Wipe off moisture, sweat or soil with a soft cloth as soon as possible.
○ To clean the soil around the joint gaps of the band, wipe it out in water and then brush it off
with a soft toothbrush. (Protect the watch body from water splashes by wrapping it up in
plastic wrap etc.)
Wipe off the remaining moisture with a soft cloth.
○ Because some titanium bracelets use pins made of stainless steel, which has outstanding
strength, rust may form in the stainless steel parts.
○ If rust advances, pins may poke out or drop out, and the watch case may fall off the bracelet,
or the clasp may not open.
○ If a pin is poking out, personal injury may result. In such a case, refrain from using the watch
and request repair.
Leather band
○ A leather band is susceptible to discoloration and deterioration from moisture, sweat and
direct sunlight.
○ Wipe off moisture and sweat as soon as possible by gently blotting them up with a dry cloth.
○ Do not expose the watch to direct sunlight for a long time.
○ Please take care when wearing a watch with light-colored band, as dirt is likely to show up.
○ Refrain from wearing a leather band watch other than Aqua Free bands while swimming,
and when working with water even if the watch itself is water-resistant enforced for daily
use.
Polyurethane band
○ A polyurethane band is susceptible to discoloration from light, and may be deteriorated by
solvent or atmospheric humidity.
○Especially a translucent, white, or pale colored band easily adsorbs other colors, resulting
in color smears or discoloration.
○ Wash out dirt in water and clean it off with a dry cloth.
(Protect the watch body from water splashes by wrapping it up in plastic wrap etc.)
○ When the band becomes less flexible, have the band replaced with a new one. If you
continue to use the band as it is, the band may develop cracks or become brittle over time.
Notes on skin irritation and allergy
Skin irritation caused by a band has various reasons such as allergy to metals or leathers, or
skin reactions against friction on dust or the band itself.
Notes on the length of the band
Adjust the band to allow a little clearance with your wrist to ensure proper airflow.
When wearing the watch, leave enough room to insert a finger between the band
and your wrist.
33
TO PRESERVE THE QUALITY OF YOUR WATCH
English

How to use an adjustable three-fold clasp
Adjustable three-fold clasp
How to adjust the length of the band
1Thread the tip of the band to the buckle.
Buckle
Tip
2Slide the band to adjust its length and find
the appropriate hole. Place the pin into the
hole.
Pin Adjusting
hole
How to wear the watch
Insert the tip of the band into the fixed loop and
movable loop, and push the buckle down to
fasten the clasp.
Fixed loop
Movable loop
Buckle
Tip
How to take off the watch
Place your finger between the band and clasp. Pinch the band with your fingers and pull it
forward to open the clasp.
* Do not pull the tip of the band to open the clasp, as this may damage the band.
Buckle
* If it is difficult to open the band following the above procedure, hold both sides of the buckle
to open the clasp.
34 TO PRESERVE THE QUALITY OF YOUR WATCH
Magnetic resistance (Magnetic influence)
Affected by nearby magnetism, a watch may temporarily gain or lose time or stop operating.
This watch is a magnetic resistant watch that is fully compliant with JIS level-1 standard.
Conditions of use
Keep the watch more than 5 cm away from magnetic products.
(JIS-1)
If the watch becomes magnetized and its accuracy deteriorates to an extent exceeding the specified
rate under normal use, the watch may need to be demagnetized. In this case, you will be charged
for demagnetization and accuracy readjustment even if it happens within the guarantee period.
Examples of common magnetic products that may affect watches
The reason why this watch is affected by magnetism
The built-in balance spring is provided with a magnet, which may be influenced by a strong external
magnetic field.
Smartphone, cellular phone, tablet terminal
(speaker, magnet of cover)
AC adapter Bag
(with magnet
buckle)
AC-powered
shaver
Magnetic
cooking device
Portable radio
(speaker)
Magnetic
necklace
Magnetic health
pillow
35
TO PRESERVE THE QUALITY OF YOUR WATCH
English

Lumibrite
If your watch has Lumibrite
Lumibrite is a luminous paint that absorbs light energy of the sunlight and lighting apparatus in a short
time and stores it to emit light in the dark. For example, if exposed to a light of more than 500 lux for
approximately 10 minutes, Lumibrite can emit light for 3 to 5 hours. Please note, however, Lumibrite
emits the light it stores, the luminance level of the light decreases gradually over time. The duration of
the emitted light may also differ slightly depending on such factors as the brightness of the place where
the watch is exposed to light and the distance from the light source to the watch.
* In general, when you enter a dark place from a bright environment, your eye cannot adapt to the
change in light levels quickly. At first, you can hardly see anything, but as time passes, your vision
gradually improves. (Dark adaptation of the human eye)
* Lumibrite is a luminous paint that is completely harmless to human beings and the natural
environment; containing no noxious materials such as radioactive substance.
Reference data on the luminance
Condition Illumination
Sunlight Fine weather 100,000 lux
Cloudy weather 10,000 lux
Indoor (Window-side
during daytime)
Fine weather more than 3,000 lux
Cloudy weather 1,000 to 3,000 lux
Rainy weather less than 1,000 lux
Lighting apparatus (40-
watt daylight fluorescent
light)
Distance to the watch: 1 m 1,000 lux
Distance to the watch: 3 m 500 lux (average room luminance)
Distance to the watch: 4 m 250 lux
36 TO PRESERVE THE QUALITY OF YOUR WATCH
Troubleshooting
Troubles Possible causes Solutions
The watch stops
operating. The mainspring has not been wound.
Wind the mainspring or swing the
watch for a few times so that the
watch will start operating.
If this action does not correct the
condition, consult the retailer from
whom the watch was purchased.
The watch loses/
gains time.
The watch has been left in extremely
high or low temperatures for a long
time.
Normal accuracy will resume when
the watch returns to normal
temperature.
The watch was brought into close
contact with a magnetic object.
Accuracy cannot be recovered.
Restoring the original accuracy
requires demagnetization (repair).
Consult the retailer from whom the
watch was purchased.
The watch was dropped, worn while
playing active sports, hit against hard
surfaces, or exposed to strong
vibrations.
Accuracy cannot be recovered.
Consult the retailer from whom the
watch was purchased.
Inspection, adjustment, and
overhaul cleaning have not been
performed for the watch for more
than 3 years.
Consult the retailer from whom the
watch was purchased.
The date
changes during
daytime.
A.m./p.m. is not correctly set. Advance the hour hand for 12 hours
and reset the time and date.
Blur in the display
persists.
Small amount of water has got inside
the watch due to deterioration of the
gasket, etc.
Consult the retailer from whom the
watch was purchased.
* For the solution of troubles other than above, contact the retailer from whom the watch was
purchased.
37
TO PRESERVE THE QUALITY OF YOUR WATCH
English