31
English
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
The patented compression key system, which is fi tted to the crowns of the
Master Compressor line models, can apply strong compression to one of the
four crown seals, thereby ensuring impeccable long-term water-resistance.
The position of the compression key, “open” or “closed”, is indicated by the ar-
row symbols (viewed from the front):
- If the indication is a white arrow, the compression key is in the compressed
seal position (“closed”); the key must be closed when you wear your watch
and when you are taking part in sporting activities. You must not make any
adjustments or set the time in this position, since this might damage the
gaskets.
- If the indication is represented by two red arrows, the compression key is in
the non-compressed seal position (“open”); in this confi guration, 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 per-
formed by turning the key using the wings in the direction indicated by the
arrow(s).
Note
The water-resistance function of the compression key is separate from the op-
eration of the crown itself. Even in the closed position, the key does not lock the
Compressed gasket position or
“closed” position
Non-compressed gasket position or
“open” position
Wings
