{"reference": {"slug": "patek-philippe-2497", "brand": "Patek Philippe", "ref": "2497", "model": "Perpetual Calendar (Mid-century)", "case_material": "18k Pink Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/patek-philippe-2497", "description": "The Patek Philippe Reference 2497 was produced between 1951 and 1963, serving as the brand's first series-produced perpetual calendar wristwatch with a center seconds hand. It utilizes the manual-wind Caliber 27-SC Q movement housed in a 37mm case, which was considered oversized for the era. Collectors prioritize this reference for its technical transition from the 1526 and its shared aesthetic DNA with the 2499 chronograph. The 18k pink gold variant is significantly rarer than the yellow gold version, with fewer than 40 examples identified in this metal. Key design evolutions include the shift from \"Feuille\" hands and applied Arabic numerals in the first series to \"Dauphine\" hands and baton markers in the second series. Current secondary market values for pink gold examples typically range from $400,000 to over $700,000, depending on provenance and case crispness, as evidenced by high-profile results at major Geneva auctions."}, "listing_stats": {"count": 1, "median": 57500.0, "low": 57500.0, "high": 57500.0, "brands": 1, "merchants": 1}, "listings": [{"id": "h_7516691431511", "title": "Patek Philippe Patek Philippe Annual Calendar Moonphase", "brand": "Patek Philippe", "model": "Patek Philippe Annual Calendar Moonphase", "reference": "—", "price_usd": 57500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Annual Calendar", "Moon Phase"], "merchant_slug": "analog-shift", "merchant_name": "Analog/Shift", "image_url": "https://cdn.shopify.com/s/files/1/0809/1255/files/AS11404_40930858_PATEKPHILIPPE_ANNUALCALENDARWGBLUEDIAL_5205G-013--6.jpg?v=1763910931", "detail_url": "https://mostexpensivewatches.net/listing/h_7516691431511", "buy_url": "https://mostexpensivewatches.net/out/h_7516691431511", "alt_buy_urls": [{"partner": "goldsmiths", "name": "Goldsmiths", "region": "UK", "url": "https://mostexpensivewatches.net/out/h_7516691431511/via/goldsmiths"}, {"partner": "selfridges", "name": "Selfridges", "region": "UK", "url": "https://mostexpensivewatches.net/out/h_7516691431511/via/selfridges"}, {"partner": "farfetch", "name": "Farfetch", "region": "Global", "url": "https://mostexpensivewatches.net/out/h_7516691431511/via/farfetch"}], "available": true}], "auction_lots": [{"slug": "patek-2497-perpetual-pink-gold", "brand": "Patek Philippe", "reference": "2497", "model": "Perpetual Calendar (Mid-century)", "case_material": "18k Pink Gold", "hammer_usd": 1452000, "year_sold": 2023, "venue": "Phillips Geneva", "lot_summary": "1950s perpetual calendar in pink gold. ~600 produced across all variants. Predecessor to 3940 and 5140 lineages.", "url": "https://mostexpensivewatches.net/auctions/patek-2497-perpetual-pink-gold"}, {"case_material": "Yellow Gold", "recap_slug": "important-watches", "source_url": "https://www.sothebys.com", "provenance": "auction_desk_verified", "year_sold": 2026, "model": "Perpetual Calendar with Center Seconds", "lot_summary": "Verified result from Important Watches (Sotheby's Hong Kong), concluded 2026-09-18. Reported by the MostExpensiveWatches auction desk with primary sources on file.", "hammer_usd": 365000, "venue": "Sotheby's Hong Kong", "reference": "2497", "brand": "Patek Philippe", "slug": "patek-philippe-perpetual-calendar-with-center-seconds-2497-2026-sotheby-s-hong-kong", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-perpetual-calendar-with-center-seconds-2497-2026-sotheby-s-hong-kong"}, {"case_material": "18k yellow gold", "recap_slug": "important-watches", "source_url": "https://www.sothebys.com/", "provenance": "auction_desk_verified", "year_sold": 2026, "model": "Perpetual Calendar", "lot_summary": "Verified result from Important Watches (Sotheby's Hong Kong), concluded 2026-09-19. Reported by the MostExpensiveWatches auction desk with primary sources on file.", "hammer_usd": 1063000, "venue": "Sotheby's Hong Kong", "reference": "2497", "brand": "Patek Philippe", "slug": "patek-philippe-perpetual-calendar-2497-2026-sotheby-s-hong-kong", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-perpetual-calendar-2497-2026-sotheby-s-hong-kong"}]}