JLC 923

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Calibre 923 is an automatic dual timezone watch movement from Jaeger-LeCoultre.

Based on Calibre 899, Calibre 923 incorporates many changes. Most obvious is the world timer mechanism, which functions more as a dual timezone readout than a true worldtimer since only a few timezones are visible at once. Also different is a uni-directional winding mechanism similar to the "Autotractor", which is more efficient, with ceramic bearings. A larger barrel provides 45 hours of power reserve, and the mechanism is more efficient thanks to re-contoured gears. Additionally, fine adjustment can be made with four regulator screws.

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Automatic movement
281 components


Hour, minute, seconds
Quickset date
GMT with AM/PM indicator
City wheel


Diameter: 29 mm
Height: 4.9 mm
31 jewels
28800 A/h
Power reserve 45 Hours

Production period: