A perpetual calendar is the most elegant complication in horology: the watch knows the date, day, month, and leap year, and adjusts automatically for months of varying length — including the leap-year exception. Set correctly, a perpetual calendar requires no manual date adjustment until 28 February 2100, when the Gregorian calendar century rule will require a correction (because 2100 is divisible by 100 but not by 400, so it will not be a leap year). The Patek Philippe Perpetual Calendar references — 5327G in white gold, 5320G with retro-style Arabic numerals, 5236P-001 with in-line calendar — are the modern standard for the complication. The AP Royal Oak Perpetual Calendar 26574 brings the perpetual calendar into the integrated-bracelet sport-watch idiom. The Vacheron Constantin Traditionnelle Perpetual Calendar in white gold or platinum is the connoisseur's choice. Perpetual calendar watches require careful service — the calendar wheels and the leap-year mechanism must be precisely set when reassembled — and our global network is the rational route to ownership for almost every reference.
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