Why a Perpetual Calendar Is a Grail Watch for Collectors

One of the ultimate feats of mechanical engineering in watches, a perpetual calendar is able to accurately display the day, date, month, year and leap year, all in the space of a normal-sized wristwatch (usually 40-42 millimeters in diameter, or about 1.58 to 1.73 inches). The watch’s mechanics are designed to recognize the length in

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