Technical characteristics
- Automatic winding mechanical movement,
Calibre 923.
- 28,800 vibrations per hour.
- Power reserve: approximately 43 hours.
- Crown with compression key.
- Water-resistant to 10 ATM.
Movement
Functions and displays
The Master Compressor Geographic model features a
dual time display which mechanically indicates (thanks to
mechanical coupling with a 24 time-zone disc according to
the international GMT system) :
- The local hour, minutes and seconds.
- The local date.
- The city selected from the 24 GMT time zones as the
second time zone.
- The hour and minutes in the second time zone selected.
- The AM/PM indication of the second time zone in the form
of an aperture which makes it possible to know whether
the time is morning (AM) or afternoon (PM).
Use
Functions associated with the crowns and corrector
Crown A (at 2 o’clock) enables you to :
- Select the city required for the second time zone in the
rotating disc at 6 o’clock, and thus automatically display its
time in the small dial.
Crown B (at 4 o’clock) enables you to :
- Wind the watch if it has not been worn for more than 43
hours.
- Synchronize the local time with that in the second time
zone, taking account of the AM/PM indication.
- Local time setting with stop seconds function (the
movement also changes time in second time zone).
Corrector C (at 3 o’clock) allows you to :
- Correct the date.
Starting the watch
Couronne B
Crown B
Turn the compression key to the «open» position in the
direction of the arrow. Crown B is thus in position 1.
A few clockwise turns of the crown are enough to set the
watch running. It will then automatically wind up while you
are wearing it. Please note that the crown does not lock on
winding, even when the watch is fully wound.
When the operation is completed, turn the compression key
to the «closed» position in the direction of the arrows.
Jaeger-LeCoultre Calibre 923.
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