{"reference": {"slug": "audemars-piguet-5516", "brand": "Audemars Piguet", "ref": "5516", "model": "Perpetual Calendar with Leap Year Indication", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-5516", "description": "Audemars Piguet produced the reference 5516 between 1955 and 1957, with a total production of only 12 units. This reference is historically significant as the first perpetual calendar wristwatch to feature a leap year indicator on the dial. The 36.5mm 18k yellow gold case houses the caliber 13VZSSQP, a manual-wind movement based on a Valjoux ebauche. Collectors distinguish between two primary dial configurations: the first three pieces featured the moon phase at 12 o’clock, while the subsequent nine units placed the moon phase at 6 o’clock with the leap year cycle at 12 o’clock. Due to its extreme rarity and technical importance, the reference 5516 commands prices in the high-six-figure to low-seven-figure range. A notable example sold at auction in 2015 for over $540,000, though current market valuations for well-preserved specimens often exceed $1,000,000."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "audemars-piguet-5516-leap-year", "brand": "Audemars Piguet", "reference": "5516", "model": "Perpetual Calendar Leap Year", "case_material": "18k Yellow Gold", "hammer_usd": 545000, "year_sold": 2015, "venue": "Christie's Geneva", "lot_summary": "The first perpetual calendar wristwatch to feature a leap year indicator on the dial. Only 12 examples of this reference were made, marking a significant milestone in the history of calendar complications.", "url": "https://mostexpensivewatches.net/auctions/audemars-piguet-5516-leap-year"}, {"slug": "audemars-piguet-5516-2017", "brand": "Audemars Piguet", "reference": "5516", "model": "Perpetual Calendar with Leap Year Indication", "case_material": "18k Yellow Gold", "hammer_usd": 675000, "year_sold": 2017, "venue": "Phillips New York", "lot_summary": "The first serially produced perpetual calendar wristwatch to feature a leap year indicator, with only nine examples ever manufactured.", "source_url": "https://www.phillips.com/detail/audemars-piguet/NY080117/15", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/audemars-piguet-5516-2017"}]}