Patek Philippe CH 28-520 C/528 User manual

CALIBER CH 28-520 C
AQUANAUT
CHRONOGRAPH
CALIBER CH 28-520 C

English ........................ 3
Français ...................... 17
Deutsch ...................... 31
Italiano ....................... 45
Español ...................... 59
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CALIBER
CH 28-520 C/528
AQUANAUTCHRONOGRAPH

English
CALIBER
CH 28-520 C/528
AQUANAUTCHRONOGRAPH
English

5
To accompany every instant of an active life,
Patek Philippe has endowed your timepiece with
the caliber CH 28-520 C – a self-winding flyback
chronograph movement epitomizing the union of
tradition and innovation. It combines classic col-
umn-wheel control with the modern, vertical disk
clutch that prevents hand bounce and rebound when
starting the chronograph. Because this clutch is vir-
tually friction-free, the sweep chronograph hand
can also be used as a continuously running second
hand. This eliminates the need for a seconds subdial.
Thanks to the flyback function, the owner can actu-
ate the pusher to initiate a new measurement while
the chronograph hand is running, which makes a
reset superfluous. The transition from the chrono-
graph to the running seconds function allows the
watch to be synchronized with a time signal using
the stop seconds feature. The large monocounter
that dominates the lower half of the dial ensures a
highly legible display of the 60 minutes of elapsed
times. Completing these indications is an aperture
for the date at 3 o’clock with instant change in a
fraction of a second.

76
DISPLAYS
Hour hand
Minute hand
Chronograph hand (sweep seconds)
Subsidiary dial:
60-minute counter
Aperture:
Date
CROWN
0Normal operation (screw-down crown)
1Manual winding
2Setting the time
CORRECTIONPUSHPIECE
Date correction
PUSHERS
Chronograph start and stop
Chronograph reset and flyback function
MOVEMENT
• Caliber CH 28-520 C/528
• Self-winding
• Flyback chronograph
• Diameter: 30 mm
• Height: 6.63 mm
• Number of parts: 308
• Number of jewels: 32
• Power reserve:
Min. 45 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, unscrew the crown completely, pull
it gently all the way out, and move the hands in
either direction. Once you have set the correct time,
push the crown home again and screw it down. We
advise against turning the hands counterclockwise
across midnight because this would require a cor-
rection of the date; however, it would not damage
the calendar mechanism.
Note: If your watch has stopped running, rst move the
hands clockwise until they pass 12 o’clock and the date
advances by one day (at midnight). Then set the correct
time. If it is past noon, move the hands forward beyond
12 o’clock again.
WINDINGCROWN
The winding crown is used to manually wind the
watch (position 1) and to set the time (position 2).
Your watch is equipped with a screw-down crown
that must be completely unscrewed before you can
perform any adjustments.
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 45 hours.
When it has stopped after depleting the power
reserve, it can be rewound by hand (about 10 clock-
wise turns of the crown).

1110
The crown must be completely unscrewed
before you can wind the watch or set the time.
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 environ-
ment or underwater: the water resistance of
your watch is assured only when the crown
is pushed home and screwed down.
Correction push pieces should be actuated
exclusively with the correction stylus that
was delivered with the watch. The use of any
other tool could damage your timepiece.
If your watch has stopped running, rewind
it by hand before performing any corrections
or adjustments (about 10 clockwise turns of
the crown).
Do not perform any date correction between
9 p.m. and 1 a.m.
Every year, the date must be corrected five
times – at the end of each month that has
fewer than 31 days.
Avoid pressing the second strap’s metal catches
against the case, so as not to scratch the bezel.
Only an Authorized Patek Philippe Retailer or
an Authorized Patek Philippe Service Center
is qualified to change the strap.
CAUTION
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
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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.
DATECORRECTION
To set the date , actuate the correction push piece
at 8 o’clock as many times as needed to display the
current date.
CHANGINGTHESTRAP
If your watch was delivered with two straps, please
note that only an Authorized Patek Philippe Retailer
or an Authorized Patek Philippe Service Center is
qualified to change the strap. Also, avoid pressing
the second strap’s metal catches against the case, so
as not to scratch the bezel.

1514
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
and a screw-down crown to protect the movement
against the ingress of dust and moisture and to pre-
vent 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 C/528
AQUANAUTCHRONOGRAPH
Français