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Since Patek Philippe created its first mass-produced perpetual calendar wristwatch, the reference 1526, in 1941, the brand's modern history has been closely tied to the perpetual calendar. In 1951, Patek Philippe introduced the reference 2497, the first mass-produced perpetual calendar wristwatch with a central seconds hand. The reference 3448, introduced in 1962, was the first self-winding perpetual calendar wristwatch. In 1981, the reference 3450 replaced the 3448 and added a leap year cycle indicator. Clearly, Patek Philippe has always
