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The Patek Philippe Annual Calendar 5146 is part of Patek Philippe Annual Calendar collection, introduced in the late 1990s. Unlike a perpetual calendar, an annual calendar only requires adjustment once a year (at the end of February), making it more user-friendly while still offering sophisticated functionality. Annual calendar function: automatically adjusts for months with 30 or 31 days, requiring manual correction only once a year (February to March transition). Moonphase adds a poetic touch and is accurate for years before needing adjustment. Cheap Patek Philippe Annual Calendar 5146 replica watches, replica Patek Philippe Annual Calendar 5146 for men.