Patek Philippe World Time Chronograph User manual

CALIBER CH 28-520 HU
WORLDTIME
CHRONOGRAPH
CALIBER CH 28-520 HU

CALIBER
CH 28-520 HU
WORLDTIMECHRONOGRAPH
English ........................ 3
Français ...................... 17
Deutsch ...................... 31
Italiano ....................... 45
Español ...................... 59
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English
CALIBER
CH 28-520 HU
WORLDTIMECHRONOGRAPH
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English

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The World Time Chronograph is the first watch in
Patek Philippe’s regular collection to unite two com-
plications 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 for the 21st century. In the development
of the new mechanical caliber CH 28-520 HU, the
watchmakers took inspiration 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 second
hand. This movement, finished in compliance with
all of the directives of the Patek Philippe Seal, is also
endowed with several trailblazing innovations includ-
ing the patented Spiromax®balance spring, which
improves isochronism.

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DISPLAYS
Hour hand
Minute hand
Chronograph hand (sweep seconds)
City disk
24-hour disk (day/night indication in colors and
sun/moon symbols)
Subsidiary dial:
30-minute counter
CROWN
1Manual winding
2Setting the time
PUSHERS
Time-zone selection
Synchronized one-hour corrections of the hour
hand (clockwise) and 1∕24th increments (15°) of the
city disk and 24-hour disk (counterclockwise)
Chronograph start and stop
Chronograph reset and flyback function
MOVEMENT
• Caliber CH 28-520 HU
• Self-winding
• Flyback chronograph
• World Time
• 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®
• Patek Philippe Seal

8 9
INSTRUCTIONS
SETTINGTHETIME
To set the time, proceed as follows:
1. Press the time-zone selection pusher at 10 o’clock
repeatedly until the city name that corresponds to
your time zone is at 12 o’clock.
2. Pull the crown out slightly and move the hands
in either direction until they indicate the time in
your time zone. Make sure the 24-hour disk indi-
cates the correct time of day directly opposite the
city name at 12 o’clock.
Once you have set the correct time, push the crown
home again.
Note: After this setting, the time and the city on the
24-hour disk indicated by the arrow at 12 o’clock corre-
spond to the time displayed by the hands.
WINDINGCROWN
The winding crown is used to manually 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 (about 10 clock-
wise turns of the crown).

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CHANGINGTHETIME
ZONE
When traveling to a different time zone, you merely
need to actuate the time-zone selection pusher at
10 o’clock until the city that represents the new time
zone is in the 12 o’clock position.
Three movements take place each time you press the
pusher: the hour hand moves clockwise in one-hour
steps while the city disk and the 24-hour disk
both advance counterclockwise by one position.
These corrections do not influence the motion of
the minute hand .
Note: The city disk does not move as long as you remain
in the same time zone, but the 24-hour disk, connected to
the dial train, will gradually rotate counterclockwise. The
interaction of the city disk and the 24-hour disk allows
you to read the time in any of the world’s 24 time zones
whenever you wish.
CHRONOGRAPH
The chronograph is started and stopped with the
pusher at 2 o’clock. It is reset to zero with the
pusher at 4 o’clock, whether the chronograph
has been stopped or is running. When you press
the pusher at 4 o’clock while the chronograph is
running, this triggers the flyback function: all the
chronograph hands fly back to zero and instantly
start a new measurement. Conversely, if you first
stop the chronograph by pressing the pusher at
2 o’clock, actuation of the pusher at 4 o’clock will
cause the chronograph hands to return to the zero
position and stay there. When resetting the chrono-
graph to zero, make sure you press the pusher at
4 o’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.

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MAINTENANCE
12
Please wind the watch and set the time before
you put the watch on. This prevents lateral
pressure on the winding stem. Please use
your fingernails to pull the crown out and
turn it gently between two fingertips.
Never pull out the crown in a humid envi-
ronment or underwater: the water resist-
ance of your watch is assured only when
the crown is pushed home.
Press the time-zone selection pusher all the
way in and release it fully before you press
it again.
If your watch has stopped running, rewind
it by hand before performing any correc-
tions or adjustments (about 10 clockwise
turns of the crown).
CAUTION 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 completed
with your name. It guarantees the authenticity 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 journals. 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, produc-
tion, and long-term maintenance of an extraordinary
timekeeping instrument.

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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. Once assembled, your self-
winding watch will run for several weeks before
leaving the workshops; it fully complies with the
stringent criteria of the Patek Philippe Seal.
ACCURACY
The rate accuracy of Patek Philippe watches is ver-
ified 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 -3 and +2 seconds per
24 hours.
The precision of a watch is determined by how accu-
rately 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. Consequently, the final test of
accuracy takes place on your wrist. Your tempera-
ment or the nature of your physical activities can
cause slight irregularities. Fluctuations in position,
temperature, or air pressure, the presence of mag-
netic fields (as produced by most electronic devices,
metal detectors, household appliances, etc.) as well
as vibrations and other factors may also affect its
accuracy. 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.
It is advisable to have a water-resistance test car-
ried out every year on your watch. This is a simple
procedure that takes only a few minutes at a prop-
erly equipped point of sale.
SERVICE
We recommend that you have your watch serviced
every three to five years. With this in mind, we
suggest that you take or send your watch to an
Authorized Patek Philippe Retailer or an Author-
ized Service Center. This gives you the assurance
that your watch will be entrusted to the hands of
a qualified Patek Philippe watchmaker in Geneva
or at an Authorized Service Center.

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The watchmaker will completely disassemble the
movement and then inspect, clean, and lubricate
all of the individual parts prior to reassembly. 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.
If you have any questions regarding the maintenance
of your watch or need the address of your closest
Authorized Patek Philippe Service Center, contact our
International Customer Service Department in Geneva,
or visit www.patek.com.
Français
CALIBRE
CH 28-520 HU
CHRONOGRAPHEÀHEUREUNIVERSELLE
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Français