Citizen 901 User manual

1
English
To determine the movement number
Your watch features a case number engraved on the
case back (refer to figure to the right).
The first four characters of the case number represent
the movement caliber number of the watch.
In the example on the right, “1234” is the movement
number.
Thank you for your purchase of this Citizen watch.
Before using the watch, read this instruction manual carefully to ensure
correct use.
After reading, be sure to store this manual in a safe place should it be needed
for future reference.
Engraving position example
The engraving position may differ
depending on watch model.

2
Safety precautions
This manual may contain certain safety advisories. Your watch should be used in
accordance with these advisories at all times to ensure optimal enjoyment of your watch
and to prevent injury to yourself, other persons and/or damage to property.
■ Safety advisories are categorized and depicted in this manual as follows:
WARNING May cause serious injury or death
CAUTION May or will cause minor or moderate injury or damage
■ Important instructions are categorized and depicted in this manual as follows:
Warning (caution) symbol followed by instructions that should be
followed and/or precautions that should be observed.

3
English
Table of contents
Setting the time and date.................................................................. 4
Mainspring ........................................................................................... 6
Mechanical watches............................................................................ 8
Water resistance ................................................................................ 10
Precautions and usage limitations ................................................ 13
Maintenance ...................................................................................... 21
Specifications..................................................................................... 22

4
Date
Crown
Setting the time and date
• When the screw down crown is equipped on your model, loosen the screw before
operation. After operation, return the crown to the normal position and tighten it.
• When the watch stops, turn the crown to the right (clockwise) in position 0to wind
the mainspring manually.
• The illustrations in this instruction manual may differ from the actual watch.
Hour hand
Minute hand
Second hand

5
English
While the hands indicate between 8:00 PM and 2:00 AM:
Do not perform steps 1and 2; otherwise, the date may not change properly.
If you want to perform the steps, first turn the crown in position 2to move the hands
so they are not indicating between 8:00 PM and 2:00 AM.
1. Pull out the crown to position 1.
2. Turn the crown to the right (clockwise) to set the date to one day before the date you
want to set.
3. Pull out the crown to position 2.
4. Turn the crown to the right (clockwise) to set the date.
• The watch indicates morning when the date changes.
5. Turn the crown to set the time.
• To set an afternoon or evening hour, turn the hands to 12:00 first, then set the time.
6. Push in the crown to position 0.
• The date is based on a 31-day calendar. Adjust the date on the 1st day after months
which have 28/29/30 days.

6
Mainspring
This watch runs using the power of the mainspring.
• Once the mainspring is wound fully, it will run for about 42 hours.
• Sufficient winding ensures stable and accurate movement.
About winding the mainspring
This watch is an automatic mechanical watch. (You can also wind the mainspring
manually.)
The mainspring is wound by swinging your arm. It is recommended to wear the watch
for more than 8 hours a day.
If you do not move your arms much in your daily life, for example you spend a lot of
time sat at a desk, the mainspring may not be wound sufficiently. In such cases, wind the
mainspring manually (see page 7).

7
English
Winding the mainspring manually
Turn the crown to the right (clockwise) in position 0.
Crown
• When the watch stops, turning the crown about 40 times will wind the mainspring
fully.
• When the mainspring is wound fully, turning the crown further does not damage the
mainspring.

8
Mechanical watches
About accuracy
The accuracy of mechanical watches in this instruction manual is static accuracy at
normal temperatures (between +5˚C and +35˚C).
The accuracy on the specifications may not be kept depending on the following
conditions of use:
• times the mainspring is wound
• position
• usage environment (temperature, magnetism, impact, etc.)
Times the mainspring is wound
Full winding of the mainspring ensures the most stable and accurate movement of
mechanical watches.
Position
When you wear the watch on the wrist, the position of the watch changes frequently,
and the movement of the watch is influenced by changes in the direction of gravity. This
affects accuracy of mechanical watches.

9
English
Usage environment (temperature, magnetism, impact, etc.)
• Because mechanical watches use metal in parts for keeping accuracy, changes in
temperature, which cause metal to expand and contract, will affect the accuracy of the
watch.
• Because mechanical watches use metal parts, exposure to magnetic fields affects
their accuracy. In order to keep the watch accurate, do NOT subject it to strongly-
magnetized objects.
• Strong shocks also affect the accuracy.
Maintenance
Mechanical watches may become inaccurate due to insufficient lubrication or wear.
Have the watch disassembled and cleaned (overhaul) every 2-3 years (charge basis).
It may be difficult to restore the watch from degradation after long-term use to its initial
performance even after repairs.

10
Name
Indication
Specification
Dial or Case back
Non-water resistant Non-water resistant
Everyday-use water resistant
watch WATER RESIST(ANT) Water-resistant to 3 atmospheres
Upgraded everyday use water-
resistant watch
WATER RESIST(ANT)
5 bar Water-resistant to 5 atmospheres
WATER RESIST(ANT)
10/20 bar
Water-resistant to 10 or 20
atmospheres
Water resistance
WARNING Water Resistance
• Refer to the watch dial and the case back for the indication of the water resistance of your watch. The
following chart provides examples of use for reference to ensure that your watch is used properly.
(The unit “1bar” is roughly equal to 1 atmosphere.)
• WATER RESIST(ANT) ××bar may also be indicated as W.R.××bar.

11
English
Water-related use
Minor exposure
to water (washing
face, rain, etc.)
Swimming and
general washing work
Skin diving,
marine sports
Scuba diving
using an air
tank
Operate the crown
or button when
the watch is wet
NO NO NO NO NO
OK NO NO NO NO
OK OK NO NO NO
OK OK OK NO NO

12
• Non-water resistant watches cannot be used underwater or in environments in contact with water.
• Water-resistance for daily use (to 3 atmospheres) means that the watch may be worn while washing
your face or in the rain, but is not to be immersed in water.
• Upgraded water-resistance for daily use (to 5 atmospheres) means that the watch may be worn while
swimming, but is not to worn while skin diving.
• Upgraded water-resistance for daily use (to 10/20 atmospheres) means that the watch may be worn
while skin diving, but not while scuba or saturated diving using helium gas.
• For a metallic, plastic or rubber watchband, wash any dirt off with water. Remove the small amounts
of dirt trapped between the crevices of the metallic band with a soft brush. If your watch is not water
resistant, be sure not to get the case of the watch wet.

13
English
Precautions and usage limitations
CAUTION To Avoid Injury
• Be particularly careful when wearing your watch while holding a small child, to avoid injury.
• Be particularly careful when engaged in strenuous exercise or work, to avoid injury to yourself and
others.
• DO NOT wear your watch while in a sauna, jacuzzi or other location where it may become excessively
hot. This may result in burns to the wearer and/or malfunction of your watch.
• Be careful when putting on or taking off your watch since there is a risk of pinching your skin or
damaging your fingernails depending on the manner in which the band is fastened.

14
CAUTION Precautions
• Always wear your watch with the crown pushed in to the normal position. If your crown is a screw
down type, be sure it is properly screwed down (locked) to the case.
• Do not operate the crown or any buttons when the watch is wet. This may allow the entrance of
moisture and cause damage to sensitive components.
• If water enters the watch or the watch fogs up and does not clear up even after a long time, consult
Authorized Service Center for inspection and/or repair.
• If a watch of upgraded water resistance for daily use is immersed in sea water or subjected to excessive
perspiration, thoroughly rinse with fresh water and wipe completely dry with a soft cloth.
• If seawater enters the watch, place the watch in a box or plastic bag and immediately take it in for
repair. Otherwise, pressure inside the watch will increase, and parts (crystal, crown, push button, etc.)
may come off.

15
English
CAUTION When Wearing Your Watch
<Band>
• The durability of a leather, cloth, or natural skin strap may be affected by moisture and perspiration.
Moreover, wet leather may cause a rash. Be sure to keep your strap dry and clean.
• It is recommended to take off the watch if it gets wet, even if the watch itself is water-resistant.
• Do not wear your watch too tightly. Try to leave enough space between the watch and your skin to
allow adequate ventilation.
• A rubber type strap may become stained by dyes or soils found in clothing and other accessories.
Since these stains may become permanent, take caution when wearing your watch with items that may
transfer color (articles of clothing, purses, dyed bracelets, etc.).
• Solvents, moisture and perspiration may cause the strap to deteriorate. Be sure to replace a strap that
has become dried, brittle, or cracked to prevent loss due to strap failure.

16
<Temperature>
• The watch may stop or the function of the watch may be impaired in extremely high or low
temperature. Do not use the watch in places where the temperature is outside the operating
temperature range as stated in the specifications.
<Magnetism>
• Exposure to strong magnetic fields will cause the movement components to become magnetized,
and the accuracy of the watch may be greatly deteriorated. Do NOT subject the watch to strongly-
magnetized health equipment (magnetic necklaces, health stomach bands etc.), magnetic latch
refrigerator doors, handbag claps, mobile phone speakers, or magnetic cooking devices.

17
English
<Strong Shock>
• Avoid dropping the watch or subjecting it to other strong impact. It may cause malfunctions and/or
performance deterioration as well as damage to the case and bracelet.
<Chemicals, Corrosive Gasses and Mercury>
• If paint thinner, benzene or other solvents or products containing these solvents (including gasoline,
nail-polish remover, cresol, bathroom cleaners and adhesives, water repellent, etc.) are allowed to
come in contact with the watch, they may cause discoloration, deterioration and damage materials
of the watch. Be careful when handling these chemicals. Contact with mercury such as that used in
thermometers may also cause discoloration of the band and case.

18
CAUTION Always Keep Your Watch Clean
• Rotate the crown while it is pressed in fully and press the buttons periodically so they do not become
stuck due to accumulations of foreign matter.
Note: Do not operate the crown or any buttons when the watch is wet.
• The case and band of the watch come into direct contact with the skin in the same manner as
undergarments. Corrosion of the metal or unnoticed soiling such as that caused by perspiration and
dirt can soil sleeves and other portions of clothing. Keep your watch clean at all times.
• The case and band of the watch come in to direct contact with the skin. This may result in unnoticed
accumulations of dirt and foreign matter caused by normal wear. Accumulated matter may cause rust,
discoloration, and premature wear. Be sure to regularly clean your watch with a soft cloth. If severe
accumulations occur, you may need to have your case and/or bracelet professionally cleaned.

19
English
• In some instances, accumulations of dirt and foreign matter may cause skin reactions. This may also
occur due to certain allergies beyond our control. If this occurs, immediately discontinue use of your
watch and consult your physician.
• Leather, cloth, and other natural skin straps may become discolored or brittle from moisture,
perspiration and/or accumulated dirt. To maximize the life of your strap, be sure to keep your leather
band clean and dry by wiping it with a soft cloth each day.
CAUTION Caring for Your Watch
• Wipe any dirt or moisture such as perspiration from the case and crystal with a soft cloth.
• If you will not be using your watch for an extended period of time, carefully wipe off any perspiration,
dirt or moisture and store in a proper location, avoiding locations subject to excessively high or low
temperatures and high humidity.

20
Luminous Feature
Your watch may feature luminous treatment to the dial and hands to aid you in reading the watch in
dimly lit environments. This luminous treatment stores light from both natural and artificial sources. It
is free from any radioactive substance or any other material that may be harmful to the environment or
human body.
• The light emission of the luminous material gradually decreases as time passes.
• The duration and amount of light emitted will vary depending on the brightness, type of and distance
from the light source, exposure time and amount/size of luminous treatment.
• When not exposed to a light source, light emission from the luminous treatment will start off bright
and gradually diminish over a period of hours. The duration of visible light emission will vary with
type of and duration of light exposure as well as size of luminous features of your watch.