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Compression keys
The compression key tted on the crowns of Master Compressor line watches is
a patented system enabling additional compression of one of the 4 crown gaskets,
which boosts your watch’s long-term water-resistance.
The “open” or “closed” position of the compression key at 3 o’clock is indicated
by the arrow symbols (viewed from the front):
- The compression key is in the compressed gasket position (“closed”) if the
indicator shows only one arrow; the keys must be closed when you wear your
watch and when you are taking part in sports. You must not make any adjust-
ments 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 arrows; in this conguration, you can
start the watch and set the functions as per the explanations below.
The switch from “closed” to “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 op-
eration of the crown itself. Even in the closed position, the key does not lock the
crown. So in practice it is possible to operate the crown when the key is in the
compressed gasket position. However, as mentioned earlier, it is extremely inad-
visable to make adjustments in this position, since this might damage the gaskets.
We recommend that you rst turn the compression key to the “open” position
before making any adjustments to your watch.
Compressed gasket position or
“closed” position
Non-compressed gasket position or
“open” position
Wing-nuts
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