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Note: Date correction should not be performed between 10:30 p.m. and 3:30
a.m. During this period the automatic date-change mechanism is already in
action.
When the operation is completed, push the crown back to position 1 and turn
the compression key to the “closed” position in the direction of the arrows.
Chronograph operation
The central seconds hand on the Master Compressor Chronograph displays the
chronograph seconds to the nearest quarter of a second. A counter located at
3 o’clock totals the minutes up to 30 minutes (after one turn it continues to count
another 30 minutes). Another counter located at 9 o’clock totals the hours up
to 12 hours (after one turn it continues to count another 12 hours).
- Pushpiece at 2 o’clock: this pushpiece enables the chronograph function to be
started and stopped.
- Pushpiece at 4 o’clock: this pushpiece resets the counters and the central
seconds hand. When timing is in progress, a press on this pushpiece has no
effect.
Each of these two pushpieces is fitted with a patented wing-nut with
compression system. This permits strong compression of one of the three push-
piece seals, ensuring optimum water resistance.
Another benefit of this system: it enables operation of the pushpieces to be
locked in the closed position, thus preventing any unintentional handling of the
chronograph.
To be able to use the chronograph functions, move the pushpieces into the
“open” position by turning the wing-nuts a quarter of a turn upwards. The non-
compressed seal position (“open”) is then indicated by an arrow (front view of
watch).
