Patek Philippe CALIBER CH 28-520 HU User manual

CALIBER CH 28-520 HU
world time chronograph

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INDEX

CALIBER CH 28-520 HU
world time chronograph

caliber CH 28-520 HU
world time chronograph
f r o n t

b a c k
f r o n t

ENGLISH
caliber ch 28-520 hu
world time chronograph

11
The World Time Chronograph is the first watch
in Patek Philippe’s regular collection to unite two
complications that rank among the manufacture’s
most emblematic achievements. It perpetuates a
tradition that so far was expressed only in unique
pieces, such as wristwatch No. 862,442 dated 1940,
and updates this legacy to the state of the 21st cen-
tury. In the development of the new mechanical
caliber CH 28-520 HU, the watchmakers took inspi-
ration from the self-winding CH 28-520 column-
wheel chronograph movement with a vertical
clutch and from Patek Philippe’s famous World
Time mechanism, a proprietary design with only
one time-zone selector which makes it extremely
easy to use. Thanks to the minimal-friction vertical
clutch, the chronograph hand (also referred to as
the trotteuse) can double as a permanently running
seconds hand.
This movement, finished in compliance with all
of the directives of the Patek Philippe Seal, is also
endowed with several trailblazing innovations,
among them the patented Spiromax®balance
spring which improves isochronism.

12
Chronograph
start/stop pusher
Chronograph reset/
flyback pusher
30-minute counter
Hour hand
Minute hand
Chronograph
hand (trotteuse)
24-hour ring
City disk
Time-zone
pusher
21
Position 1:
Winding
Position 2:
Setting the time

13
INSTRUCTIONS
winding crown
The winding crown is used to wind the watch
(position 1) and to set the time (position 2).
winding
Your watch incorporates a self-winding movement.
The movements of your wrist set a centrifugal mass
in motion: this tensions the mainspring which
stores the energy. When you take off your fully
wound watch, it will continue to run for at least
50 hours. When it has stopped after depleting the
power reserve, it can be rewound by hand with
about 10 turns of the crown. Please wind the watch
before you put it on. This way, you can avoid lateral
pressure on the winding stem which in the course
of the years could damage the stem tube.
setting the time
To set the time, proceed as follows:
1. Press the pusher at 10 o’clock as often as needed
to advance the city name that represents your
time zone to the 12 o’clock position.
2. Pull the crown out and move the hands clock-
wise or counterclockwise until they indicate the
time in your time zone. Make sure the 24-hour
ring indicates the correct time of day directly
opposite the city name at 12 o’clock. The illustra-
tion shows local time in London at 10.10 a.m.

14 Push the crown home again.
After you have performed these settings, the local
time indicated with the hour and minute hands
will correspond to the time displayed on the
24-hour ring beneath the city name at 12 o’clock
(at the top of the dial).
Caution: Please take off the watch before you set the time.
This prevents lateral pressure on the winding stem tube. Please
use your fingernails to pull the crown out and turn it gently
between two fingertips.
Never pull out the crown in a humid environment or under-
water. The water resistance of your watch is assured only
when the crown is pushed home.
changing the time zone
When traveling to a different time zone, you
merely need to actuate the time-zone pusher at
10 o’clock until the city that represents the new
time zone is in the 12 o’clock position.
Three corrections are made each time the pusher
is pressed: the hour hand moves clockwise in one-
hour steps while the city disk and the 24-hour ring
both move counterclockwise.
These corrections do not influence the motion of
the minute hand.
Note: Press the time-zone pusher all the way in and release
it fully before you press it again.
The city disk does not move as long as you remain in the
same time zone, but the 24-hour ring, connected to the dial
train, will gradually rotate counterclockwise. The interaction
of the city disk and the 24-hour ring allows you to read the
time in any of the world’s 24 time zones whenever you wish.

15
chronograph
The chronograph is started and stopped by con-
secutively pressing the pusher at 2o’clock. The
chronograph and minute-counter hands are reset
to zero with the pusher at 4o’clock, either when
the chronograph is stopped or during an ongoing
measurement (flyback). If the pusher at 4o’clock is
pressed while the chronograph and minute-coun-
ter hands are running, the two hands will instantly
jump to zero and start a new measurement right
away. This is referred to as the flyback function. If
the chronograph is first stopped with the pusher
at 2o’clock, pressing the pusher at 4o’clock will
return the chronograph and minute-counter hands
to zero. They will stay there until the next meas-
urement is started. To reset the chronograph hand,
make sure you press the pusher at 4o’clock firmly
and squarely in the middle.
Note: If the chronograph function is not needed, the chrono-
graph hand can continue to run just like an ordinary sweep
seconds hand. This will not cause premature wear of the
clutch mechanism or reduce the power reserve.

16 TAKING CARE
OF YOUR WATCH
certificate of origin
Your watch is delivered with a certificate of origin
that indicates the movement and case numbers.
The certificate is valid only if it is dated, signed by
an Authorized Patek Philippe Retailer, and com-
pleted with your name. It guarantees the authen-
ticity of your watch and validates your warranty
privileges for a period of two years after the date
of sale. The unique movement and case numbers of
each watch are transcribed into the workshop jour-
nals. With this information, you may have yourself
entered in the Patek Philippe Register of Owners
and will obtain the International Patek Philippe Magazine
free of charge.
patek philippe seal
As an all-encompassing hallmark of
quality, the Patek Philippe Seal applies
to the entire watch, including the
movement, case, dial, hands, pushers,
strap, and clasp as well as to all other
facets that contribute to the precision and aesthetic
perfection of the timepiece. It covers the technical,
functional, and aesthetic factors, but also rate accu-
racy, dependability, and customer service quality.
Additionally, it reflects the maker’s know-how and
all other assets needed for the development, pro-
duction, and long-term maintenance of an extraor-
dinary timekeeping instrument.

17
quality control
The movements and completely assembled watches
are subject to a series of technical tests and visual
inspections to verify their rate accuracy, winding
speed, power reserve, reliability, water resistance,
and overall appearance. After it was assembled,
your self-winding watch will already have run for
several weeks before leaving the workshops; it
fully complies with the stringent criteria of the
Patek Philippe Seal.
rate accuracy
The rate accuracy of Patek Philippe watches is veri-
fied in several phases of manufacturing, both with
uncased and fully cased movements. The final test
is performed with a wrist motion simulator and
the results must conform to the following Patek
Philippe precision benchmarks:
The rate accuracy of calibers with a diameter of 20 mm or
larger must range within –3and +2seconds per 24 hours.
The precision of a watch is determined by how
accurately it keeps the time. A watch that is fast
or slow is considered precise if the amount by
which it is fast or slow remains constant. Such a
deviation can be easily corrected. The last test of
accuracy takes place on your wrist. Your tempera-
ment or the nature of your physical activities can
cause slight irregularities. Fluctuations in posi-
tion, temperature, or air pressure, the presence of
magnetic fields (as produced by most electronic
devices, metal detectors, household appliances,
etc.) as well as vibrations and other factors may
also affect its accuracy.

18 If you notice that your watch exhibits such
irregularities, please do not hesitate to take it
to an Authorized Patek Philippe Retailer or an
Authorized Service Center where no effort will
be spared to assure that it is adjusted to meet your
expectations.
water resistance
Your watch is fitted with different types of seals
to protect the movement against the ingress of
dust and moisture and to prevent damage if it is
immersed in water. Nonetheless, we recommend
that you prevent direct contact with water if your
watch has a leather strap.
service
We recommend that you have your watch serviced
at least once every five years. For this purpose, we
suggest that you bring or send your watch to an
Authorized Patek Philippe Retailer or an Authorized
Service Center. This gives you the assurance that
your watch will be entrusted to hands of a qualified
Patek Philippe watchmaker in Geneva or at one of
our Authorized Service Centers around the world.
The watchmaker will completely disassemble the
movement and then clean and inspect all parts
and lubricate them in the reassembly process. All
functions of the watch will also be tested in detail
and the escapement regulated if necessary. Finally,
its rate accuracy will be monitored and precision-
adjusted for a further period of two weeks. The
entire process may take several weeks because
each watch must undergo a complete series of tests
to fulfill the strict quality criteria of Patek Philippe.

19
If you have any questions regarding the maintenance of your
watch or need the address of the Authorized Patek Philippe
Service Center nearest you, contact our International Customer
Service department in Geneva, or visit www.patek.com.

20
SPECIFICATIONS OF THE MOVEMENT
SELF-WINDING MECHANICAL MOVEMENT
CALIBER CH 28-520 HU
DIAMETER 33 mm
HEIGHT 7.97 mm
NUMBER OF PARTS 343
NUMBER OF JEWELS 38
POWER RESERVE Min. 50 hours – max. 55 hours
WINDING ROTOR Central rotor in 21K gold,
unidirectional winding
BALANCE Gyromax®
FREQUENCY 28,800 semi-oscillations/hour (4Hz)
BALANCE SPRING Spiromax®
HALLMARK Patek Philippe Seal
displays
– Hours and minutes
– Sweep chronograph/seconds hand
– City disk
– 24-hour ring with day/night indication in colors
and sun/moon symbols
– 30-minute counter
time-zone pusher at 10 o’clock
Synchronized one-hour corrections of the hour hand (clockwise)
and 1/24th increments (15°) of the city disk and 24-hour ring
(counterclockwise).
chronograph pushers
Chronograph start and stop at 2 o’clock
Chronograph reset or flyback at 4 o’clock