4IWCIngenieurPerpetualCalendarDigitalDateMonth

IWC's Ingenieur Perpetual Calendar Digital Date-Month (Ref. 3792) features a perpetual calendar, digital date display and leap year indicator. Every night, when the date display advances, the integrated IWC quick-action switch siphons off a little of the energy, stores it and then discharges it precisely at the end of the month.

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