Patek Philippe CALIBER 240 HU Manual Del Usuario página 14

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Caution:
Please 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 environment or underwa-
ter: the water resistance of your watch is assured only when
the crown is pushed home.
switching time zones
To switch the time zone, you merely need to press
the pusher at 10 o'clock repeatedly until the city
which represents the destination time zone is at
12 o'clock.
Three movements take place each time you press
the pusher: the hour hand advances by one hour,
and the city ring and the 24-hour ring both advance
counterclockwise by one position.
The minute hand is not affected by a time zone
change and continues to advance independently.
Note:
Please fully release the time-zone pusher before you
press it again.
As long as you do not travel to a different time zone, the city
ring will remain stationary. However, the 24-hour ring will
continuously move counterclockwise because it is coupled with
the movement. By means of the city ring and the 24-hour ring,
you can read the current time in all of the world's 24 time
zones whenever you wish.