How to set the moon phase on the Girard-Perregaux Vintage 1945 2583552121BACA watch?

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Accepted Answer

To set the moon phase on your Girard-Perregaux Vintage 1945 watch (reference 2583552121BACA), you need to use the corrector located at 8 o'clock on the watch case.

Adjustment procedure:

Use the small tool (pusher) provided with your watch to press the corrector located at 8 o'clock
Press the corrector as many times as necessary until the desired moon phase is displayed correctly in the window
Each press on the corrector corresponds to a one-day advance in the lunar cycle
The disk adorned with two moons placed in a starry sky will gradually turn to show you the new moon, the first quarter, the full moon, and the last quarter

Identifying the lunar cycle: Before starting the adjustment, consult a lunar calendar or a specialized app to identify the current moon phase. This will help you know how many times to press the corrector to synchronize your watch with the actual cycle.

Important warning: Never attempt to correct the moon phase between 3 PM and 3 AM. During this period, the date change mechanism is engaged, and any intervention could damage the movement. Be sure to check the position of the hour hand before making adjustments.

Work carefully using the small tool provided and never force the mechanism. This operation is simple but requires delicacy to preserve the integrity of the mechanical movement of your luxury watch.

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