IWC Schaffhausen BIG PILOT'S WATCH PERPETUAL CALENDAR Mode D'emploi page 30

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The moon phase display is automatically set by the calendar so that it is always correct. The trans-
mission ratio is so precise that the display deviates by only a single day after 577.5 years.
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MOON PHASE DISPL AY
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1 Full moon
2 Waning moon
3 New moon
4 Waxing moon
BIG PILOT'S WATCH PERPETUAL CALENDAR
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