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the daily stresses and strains that await it when worn on your wrist.
The criteria of the “1000 Hours Control” programme considerably exceed the
standards of offi cial timing tests, which deal only with part of the movement.
Jaeger-LeCoultre tests not only the movement prior to its being cased up in the
watch, but also the watch as a whole.
Compression keys
Equipping the crowns of the Master Compressor line models, the patented com-
pression key system can apply strong compression to one of the 4 crown seals,
thereby ensuring impeccable long-term water resistance.
The “open” or “closed” position of the compression key is indicated by the arrow
symbols (viewed from the dial side):
- The compression key is in the compressed seal position (“closed”) if the indi-
cation is a white arrow; the keys must be closed when you wear your watch
and when you are taking part in sports. You must not make any adjustments
or set the time in this position, since this might damage the gaskets.
- The compression key is in the non-compressed seal position (“open”) if the
indication is represented by two red arrows; in this configuration, you may
proceed to start the watch and adjust the functions according to the indica-
tions below.
The transition from the “closed” to the “open” position, or vice-versa, is
performed by turning the key using the wing-nuts in the direction indicated by
the arrow(s).
Compressed seal position
(“closed”)
Position of seal without compression
(“open”)
Wing-nuts
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