{"reference": {"slug": "patek-philippe-1591", "brand": "Patek Philippe", "ref": "1591", "model": "Calatrava 1591 Stainless Steel", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/patek-philippe-1591", "description": "The Patek Philippe reference 1591 was produced during the 1940s, with this specific stainless steel execution dating to approximately 1944. Collectors prioritize this reference because it is a perpetual calendar with a central seconds hand and an indirect drive movement, specifically the caliber 12'''120 SC modified by Victorin Piguet. The case features a 35mm diameter and a screw-down back, a rare technical specification for Patek Philippe complications of this era. Only two examples in stainless steel are known to exist, making it significantly rarer than its yellow gold counterparts. On the secondary market, this reference commands prices in the mid-seven-figure range. A notable auction result occurred in 2007 when a stainless steel 1591, previously owned by a Maharajah, sold for over 2.2 million CHF, establishing it as one of the most expensive steel wristwatches ever sold at that time."}, "listing_stats": {"count": 7, "median": 23000.0, "low": 13500.0, "high": 38500.0, "brands": 1, "merchants": 3}, "listings": [{"id": "h_7556728815725", "title": "Patek Philippe 1970s Patek Philippe Stainless Steel Calatrava (Ref. 3579-1) W/ Box, Accessories, & Original Sales Receipt", "brand": "Patek Philippe", "model": "1970s Patek Philippe Stainless Steel Calatrava (Ref. 3579-1) W/ Box, Accessories, & Original Sales Receipt", "reference": "3579-1", "price_usd": 26000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img031570.jpg?v=1730250836", "detail_url": "https://mostexpensivewatches.net/listing/h_7556728815725", "buy_url": "https://mostexpensivewatches.net/out/h_7556728815725", "available": true}, {"id": "h_8134188269677", "title": "Patek Philippe 1957 Patek Philippe Stainless Steel Calatrava Anti-Magnetic 'First Series' (Ref. 3418) Silver \"Beyer\" Dial W/ Extract From The Archive", "brand": "Patek Philippe", "model": "1957 Patek Philippe Stainless Steel Calatrava Anti-Magnetic 'First Series' (Ref. 3418) Silver \"Beyer\" Dial W/ Extract From The Archive", "reference": "1957", "price_usd": 24500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img044499_bbb9eacc-8323-4746-9cd1-c7cfcc65745a.jpg?v=1782428639", "detail_url": "https://mostexpensivewatches.net/listing/h_8134188269677", "buy_url": "https://mostexpensivewatches.net/out/h_8134188269677", "available": true}, {"id": "h_15675593294207", "title": "Patek Philippe Stainless steel Patek Philippe Calatrava wristwatch", "brand": "Patek Philippe", "model": "Stainless steel Patek Philippe Calatrava wristwatch", "reference": "G3536", "price_usd": 23000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "somlo", "merchant_name": "Somlo London", "image_url": "https://cdn.shopify.com/s/files/1/0161/6687/9332/files/G3536_1.jpg?v=1778667450", "detail_url": "https://mostexpensivewatches.net/listing/h_15675593294207", "buy_url": "https://mostexpensivewatches.net/out/h_15675593294207", "available": true}, {"id": "h_7102713954387", "title": "Patek Philippe Calatrava | 6007A | Limited Series | Stainless Steel", "brand": "Patek Philippe", "model": "Calatrava | 6007A | Limited Series | Stainless Steel", "reference": "6007A", "price_usd": 38500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/files/Patek_Philippe_Calatrava_Limitedseries_6007A_001_stainlesssteel_A_Collected_Man_London_Thumbnail_00.jpg?v=1700569706", "detail_url": "https://mostexpensivewatches.net/listing/h_7102713954387", "buy_url": "https://mostexpensivewatches.net/out/h_7102713954387", "available": false}, {"id": "h_7558240698477", "title": "Patek Philippe Tropical 1950s Patek Philippe Stainless Steel Calatrava 'Anti-Magnetic' (Ref. 3418) \"First Series\"", "brand": "Patek Philippe", "model": "Tropical 1950s Patek Philippe Stainless Steel Calatrava 'Anti-Magnetic' (Ref. 3418) \"First Series\"", "reference": "3418", "price_usd": 14500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img031711_8c80b26f-4385-4cde-b1fd-e17eef7ecb80.jpg?v=1730937336", "detail_url": "https://mostexpensivewatches.net/listing/h_7558240698477", "buy_url": "https://mostexpensivewatches.net/out/h_7558240698477", "available": false}, {"id": "h_6918755745875", "title": "Patek Philippe Limited Edition Calatrava for Japan | 3718 | Stainless Steel", "brand": "Patek Philippe", "model": "Limited Edition Calatrava for Japan | 3718 | Stainless Steel", "reference": "3718", "price_usd": 13850.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/products/Patek_Philippe_Calatrava_3718_Stainless_Steel_A_Collected_Man_London_WSS_P1379_12.jpg?v=1670954200", "detail_url": "https://mostexpensivewatches.net/listing/h_6918755745875", "buy_url": "https://mostexpensivewatches.net/out/h_6918755745875", "available": false}, {"id": "h_6740134854739", "title": "Patek Philippe Calatrava Reference 3718 | Stainless Steel", "brand": "Patek Philippe", "model": "Calatrava Reference 3718 | Stainless Steel", "reference": "3718", "price_usd": 13500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/products/Patek_Philippe_Calatrava_Reference3718_A_Collected_Man_London_WSS_P1405_08.jpg?v=1649080269", "detail_url": "https://mostexpensivewatches.net/listing/h_6740134854739", "buy_url": "https://mostexpensivewatches.net/out/h_6740134854739", "available": false}], "auction_lots": [{"slug": "patek-1591-stainless", "brand": "Patek Philippe", "reference": "1591", "model": "Calatrava 1591 Stainless Steel", "case_material": "Stainless Steel", "hammer_usd": 2440000, "year_sold": 2024, "venue": "Phillips Geneva", "lot_summary": "Patek made just 4 examples of 1591 in steel. Calatrava cross hour markers. One of the rarest steel Pateks in existence.", "url": "https://mostexpensivewatches.net/auctions/patek-1591-stainless"}]}