{"reference": {"slug": "patek-philippe-1527", "brand": "Patek Philippe", "ref": "1527", "model": "Perpetual Calendar Chronograph", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/patek-philippe-1527", "description": "The Patek Philippe Reference 1527 was produced between 1940 and 1944, with only two known examples featuring the perpetual calendar chronograph complication. This specific 18k yellow gold reference is a precursor to the 2499, utilizing a 37.6mm case that was considered oversized for the era. It houses the Valjoux-based caliber 13''' movement and features a dial with a tachymeter scale, moon phase aperture, and date sub-dial. Collectors value this reference for its historical role as a unique prototype that defined the aesthetic of Patek Philippe’s mid-century complicated watches. Due to its extreme rarity, the watch does not have a standard secondary market bracket, though it commands high-seven-figure prices at auction. In 2010, this specific yellow gold perpetual calendar chronograph sold at Christie’s for approximately $5.7 million, establishing it as one of the most expensive vintage wristwatches ever sold."}, "listing_stats": {"count": 11, "median": 178000.0, "low": 13500.0, "high": 340000.0, "brands": 1, "merchants": 5}, "listings": [{"id": "h_7690293248209", "title": "Patek Philippe Patek Philippe Perpetual Calendar Chronograph 5270P-014", "brand": "Patek Philippe", "model": "Patek Philippe Perpetual Calendar Chronograph 5270P-014", "reference": "5270P-014", "price_usd": 178000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Platinum", "case_size_mm": 41.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph"], "merchant_slug": "material-good", "merchant_name": "Material Good", "image_url": "https://cdn.shopify.com/s/files/1/0561/5190/0369/files/IMG_1955.jpg?v=1767993624", "detail_url": 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"available": false}, {"id": "h_7017226043501", "title": "Patek Philippe 2010 Patek Philippe Perpetual Calendar Moonphase Chronograph (Ref. 5970P) Platinum W/ Box, Papers, & Accessories", "brand": "Patek Philippe", "model": "2010 Patek Philippe Perpetual Calendar Moonphase Chronograph (Ref. 5970P) Platinum W/ Box, Papers, & Accessories", "reference": "5970P", "price_usd": 320000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Platinum", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph", "Moon Phase"], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img018918.jpg?v=1687394899", "detail_url": "https://mostexpensivewatches.net/listing/h_7017226043501", "buy_url": "https://mostexpensivewatches.net/out/h_7017226043501", "available": false}, {"id": "h_7675309031511", "title": "Patek Philippe Patek Philippe Perpetual Calendar Chronograph", "brand": "Patek Philippe", "model": "Patek Philippe Perpetual Calendar Chronograph", "reference": "40931032", "price_usd": 270000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph"], "merchant_slug": "analog-shift", "merchant_name": "Analog/Shift", "image_url": "https://cdn.shopify.com/s/files/1/0809/1255/files/AS12357_40931032_PATEKPHILIPPE_PERPETUALCALCHRONOPLATBLKDIADIAL_3970P-019--1.jpg?v=1782331597", "detail_url": "https://mostexpensivewatches.net/listing/h_7675309031511", "buy_url": "https://mostexpensivewatches.net/out/h_7675309031511", "available": false}, {"id": "h_8129437597805", "title": "Patek Philippe 2008 Patek Philippe Perpetual Calendar Moonphase Chronograph 18K YG (Ref. 5970J) W/ Box, Certificate of Origin, Accessories, & Recent Patek Philippe Service 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"a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/files/Patek_Philippe_Perpetual_Calendar_Chronograph_3970EG_025_white_gold_A_Collected_Man_London_Thumbnail_00.jpg?v=1749214956", "detail_url": "https://mostexpensivewatches.net/listing/h_15016512029049", "buy_url": "https://mostexpensivewatches.net/out/h_15016512029049", "available": false}, {"id": "h_15243169333625", "title": "Patek Philippe Perpetual Calendar Chronograph | 5970R-001 | Rose Gold", "brand": "Patek Philippe", "model": "Perpetual Calendar Chronograph | 5970R-001 | Rose Gold", "reference": "5970R-001", "price_usd": 120000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Rose Gold", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph", "Moon Phase"], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/files/Patek_Philippe_Perpetual_Calendar_Chronograph_5970G_001_rose_gold_A_Collected_Man_London_Thumbnail_00.jpg?v=1763717739", "detail_url": "https://mostexpensivewatches.net/listing/h_15243169333625", "buy_url": "https://mostexpensivewatches.net/out/h_15243169333625", "available": false}, {"id": "h_16066779382105", "title": "Patek Philippe Patek Philippe Calatrava Two-Tone Dial ref. 1527 in 18k Yellow Gold", "brand": "Patek Philippe", "model": "Patek Philippe Calatrava Two-Tone Dial ref. 1527 in 18k Yellow Gold", "reference": "1527", "price_usd": 13500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Yellow Gold", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "bulang-and-sons", "merchant_name": "Bulang & Sons", "image_url": "https://cdn.shopify.com/s/files/1/0961/8613/8969/files/W-3580PatekPhilippeCalatravatwotonedialref1527in18kyellowgold_08_1x1_4cadf590-7717-41b4-be39-08b95842648c.jpg?v=1769166463", "detail_url": "https://mostexpensivewatches.net/listing/h_16066779382105", "buy_url": "https://mostexpensivewatches.net/out/h_16066779382105", "available": false}], "auction_lots": [{"slug": "patek-philippe-1527-2010", "brand": "Patek Philippe", "reference": "1527", "model": "Perpetual Calendar Chronograph", "case_material": "18k Yellow Gold", "hammer_usd": 5708885, "year_sold": 2010, "venue": "Christie's Geneva", "lot_summary": "A unique and historically important tonneau-shaped perpetual calendar chronograph that served as a precursor to the legendary Ref. 2499.", "source_url": "https://www.christies.com/en/lot/lot-5314001", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/patek-philippe-1527-2010"}]}