{"reference": {"slug": "longines-13zn-vintage-chronograph-gold", "brand": "Longines", "ref": "13ZN", "model": "Vintage Chronograph 13ZN", "case_material": "18k Yellow Gold", "url": "https://mostexpensivewatches.net/reference/longines-13zn-vintage-chronograph-gold", "description": "The Longines 13ZN chronograph was produced from 1936 until approximately 1947. Collectors prioritize this reference for its 13ZN caliber, which was the first serially produced wristwatch movement to feature a flyback function. In 18k yellow gold, the watch typically features a multi-step bezel or a \"tre tacche\" case construction with a diameter ranging from 34mm to 38mm. Dial configurations often include tachymeter or telemeter scales in enamel or silvered finishes. Due to the movement's technical complexity and the brand's transition to outsourced calibers later in the century, these pieces are considered significant historical artifacts. Current secondary market prices for 18k yellow gold examples generally range from $25,000 to over $100,000 depending on case size and dial originality. A notable 1940s oversized 38mm yellow gold variant reached a hammer price of approximately $120,000 at a major 2022 auction."}, "listing_stats": {"count": 4, "median": 53475.0, "low": 6500.0, "high": 100000.0, "brands": 1, "merchants": 2}, "listings": [{"id": "h_16063118279001", "title": "Longines Longines 13ZN Chronograph Sandwich Dial in 18k Yellow Gold", "brand": "Longines", "model": "Longines 13ZN Chronograph Sandwich Dial in 18k Yellow Gold", "reference": "W-3544", "price_usd": 100000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Yellow Gold", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "bulang-and-sons", "merchant_name": "Bulang & Sons", "image_url": "https://cdn.shopify.com/s/files/1/0961/8613/8969/files/W-3544Longines13ZNchronographSandwichdialin18kyellowgold_222_1x1_8399bbb4-9566-4893-adc9-b2c1bdb9e1c9.jpg?v=1768980927", "detail_url": "https://mostexpensivewatches.net/listing/h_16063118279001", "buy_url": "https://mostexpensivewatches.net/out/h_16063118279001", "available": true}, {"id": "h_15751432569177", "title": "Longines Longines 5699 Sommatore Steel Chronograph 13ZN Calibre", "brand": "Longines", "model": "Longines 5699 Sommatore Steel Chronograph 13ZN Calibre", "reference": "5699", "price_usd": 99000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 39.5, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "bulang-and-sons", "merchant_name": "Bulang & Sons", "image_url": "https://cdn.shopify.com/s/files/1/0961/8613/8969/files/W-709_Longines_13ZN_Sommatore_Chronograph_02_2048x2048_d43b82ee-cbc6-4ec8-b458-9e412b7745d8.jpg?v=1756207310", "detail_url": "https://mostexpensivewatches.net/listing/h_15751432569177", "buy_url": "https://mostexpensivewatches.net/out/h_15751432569177", "available": false}, {"id": "h_7702233415789", "title": "Longines *Unpolished* Tropical 1946 Longines Flyback Chronograph 'Cal. 13ZN' (Ref. 4994) \"Presented From The Middle Atlantic Motorcycle Dealers Association\" W/ Extract From The Archive", "brand": "Longines", "model": "*Unpolished* Tropical 1946 Longines Flyback Chronograph 'Cal. 13ZN' (Ref. 4994) \"Presented From The Middle Atlantic Motorcycle Dealers Association\" W/ Extract From The Archive", "reference": "1946", "price_usd": 7950.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/files/Img037910_de369b39-c193-42b2-9f14-1ce9afa1c203.jpg?v=1754686907", "detail_url": "https://mostexpensivewatches.net/listing/h_7702233415789", "buy_url": "https://mostexpensivewatches.net/out/h_7702233415789", "available": false}, {"id": "h_6953365405805", "title": "Longines 1944 Longines Flyback Chronograph 'Cal. 13ZN' (Ref. 5449) W/ Extract From The Archive", "brand": "Longines", "model": "1944 Longines Flyback Chronograph 'Cal. 13ZN' (Ref. 5449) W/ Extract From The Archive", "reference": "1944", "price_usd": 6500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "craft-and-tailored", "merchant_name": "Craft + Tailored", "image_url": "https://cdn.shopify.com/s/files/1/1104/9180/products/Img011545.jpg?v=1670477222", "detail_url": "https://mostexpensivewatches.net/listing/h_6953365405805", "buy_url": "https://mostexpensivewatches.net/out/h_6953365405805", "available": false}], "auction_lots": [{"slug": "longines-13zn-chronograph-1942", "brand": "Longines", "reference": "13ZN", "model": "13ZN Flyback Chronograph", "case_material": "18k Pink Gold", "hammer_usd": 175000, "year_sold": 2024, "venue": "Phillips Hong Kong", "lot_summary": "1940s flyback chronograph movement — among the finest chronograph calibres ever made. Pink gold cases very rare.", "url": "https://mostexpensivewatches.net/auctions/longines-13zn-chronograph-1942"}, {"slug": "longines-13zn-steel-sector", "brand": "Longines", "reference": "13ZN", "model": "13ZN Chronograph", "case_material": "Stainless Steel", "hammer_usd": 100000, "year_sold": 2016, "venue": "Phillips Geneva", "lot_summary": "The 13ZN was the first flyback chronograph movement for the wrist. This steel example with a sector dial represents the peak of Longines' golden era of movement manufacturing.", "url": "https://mostexpensivewatches.net/auctions/longines-13zn-steel-sector"}, {"slug": "longines-13zn-2018", "brand": "Longines", "reference": "13ZN", "model": "Flyback Chronograph", "case_material": "18k Yellow Gold", "hammer_usd": 15000, "year_sold": 2018, "venue": "Bonhams New York", "lot_summary": "Features the legendary Calibre 13ZN, the first wristwatch movement equipped with a flyback function, housed in a rare gold case.", "source_url": "https://www.bonhams.com/auctions/24662/lot/52/", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/longines-13zn-2018"}]}