The “1000 Hours Control” test by Jaeger-LeCoultre
Jaeger-LeCoultre subjects each of its watches to the rigourous
“1000 Hours Control” test programme. Unique in its kind,
this programme consists of 1000 hours of comprehensive,
stringent checks.
The “1000 Hours Control” seal or marking affixed or engraved
on the back of your watch certifies that it has undergone this
observation programme in our laboratories and has passed all
the tests: rate regularity checks, temperature and atmospheric
pressure tests, resistance to impacts and magnetic fields and
the water-resistance tests. Your watch is therefore capable of
withstanding the trials awaiting it in everyday life when you
wear it on your wrist.
The criteria of the “1000 Hours Control” programme go far
beyond the official timekeeping test standards, which concern
only part of the movement. Jaeger-LeCoultre tests not only
the movement before casing it within in the watch, but also
the watch as a whole.
Compression key
Equipping the crowns of the Master Compressor line models,
the patented compression key system can apply strong
compression to one of the 4 crown gaskets, 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 front):
- The compression key is in the compressed gasket position
(“closed”) if the indication 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 gasket
position (“open”) if the indication is represented by two
red arrows; in this configuration, you can then start the
watch and set the functions as per the explanations below.
The switch from the “closed” to the “open” position, or vice-
versa, is made by turning the key using the wing-nuts in the
direction indicated by the arrow(s).
Note
The water-resistance function of the compression key is
separate from the operation of the crown itself. Even in
the closed position, the key does not lock the crown. So in
practice it is possible to handle the crown when the key is
in the compressed gasket position. However, as mentioned
earlier, it is extremely inadvisable to make adjustments in this
position, since this might damage the gaskets. We recommend
that you first turn the compression key to the “open” position
before making any adjustments to your watch.
Instructions for use
Master Compressor Extreme LAB
Technical specifications
- Mechanical automatic movement,
Calibre 988C.
- 28,800 vibrations/hour.
- Power reserve: approximately 48 hours.
- Crown with compression key.
- Water-resistant to 10 ATM
Movement
Jaeger-LeCoultre Calibre 988C.
Compressed gasket position
or "closed" position
Non-compressed gasket position
or "open" position
Wing-nuts
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