Watches + Dictionary = Watchionary
Perpetual Calendar
H. Moser & Cie. Streamliner Perpetual Calendar,
Perpetual Calendar

A ‘perpetual calendar’ watch accurately displays date, day, month and, generally, moon phases until the year 2100, accounting for leap years, 28 days in February and the difference between 30- and 31-day months. The perpetual calendar usually includes the year and moon phases.

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