Automatic Chronograph With Moon Phase; Calibres 9904, 9905 - Omega 1151 Operating Instructions Manual

2 Operating instructions

Automatic chronograph with moon phase

CALIBRES 9904, 9905

Watch functions:
The crown has 3 positions:
1. Normal wearing position: the crown pushed in against the case
guarantees water resistance.
Occasional winding: if the watch hasn't been worn for 60 hours
or more, wind the watch by turning the crown whilst in Position 1.
2. Date and moon phase correction: Pull the crown out to
Position 2. Move the crown forward to correct the moon phase.
Shift the disc forward to "full moon" position, then turn the crown
past enough "notches" to get rid of the days since the last full moon
(consult a calendar). Turn the crown backwards to correct the date.
Return the crown to Position 1.
3. Setting the time: hour – minute – seconds. As you pull the crown
out to Position 3, the seconds hand will stop. Move the crown
forward or backwards as needed. Synchronise seconds by pushing
the crown back to Position 1 at the stroke of the hour.
Chronograph functions:
• Push-piece A: start – stop, start – stop, etc.
Timekeeping from 1/8 of a second to 12 hours.
• Push-piece B: reset to zero (after one stop).
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(fig. XXIX)