Patek Philippe World Time Chronograph, Manual

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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.