{"reference": {"slug": "zenith-calibre", "brand": "Zenith", "ref": "CALIBRE", "model": "Zenith x Voutilainen x Phillips Unique Piece", "case_material": "Niobium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/zenith-calibre", "description": "The Zenith x Voutilainen x Phillips Unique Piece Calibre 135-O was produced in 2022 as a singular execution for the Geneva Watch Auction: XVI. This reference is valued for its historical movement, a 1950s-era Calibre 135 Observatoire chronometer movement restored and decorated by Kari Voutilainen. Unlike the limited edition of ten pieces in platinum, this unique piece features a 38mm case constructed from niobium, a rare refractory metal. The dial is made of guilloché-engraved blue gold with a matte finish and features a large sub-seconds register. As a unique piece, it does not have a standard secondary market price range, but it achieved a final sale price of 315,000 CHF at auction in November 2022. This specific reference represents the only time a vintage Zenith observatory movement has been housed in a niobium case for public sale."}, "listing_stats": {"count": 9, "median": 7800.0, "low": 6950.0, "high": 15000.0, "brands": 1, "merchants": 1}, "listings": [{"id": "h_8379639464115", "title": "Zenith Zenith DEFY Skyline C.X Ceramic Edition (Pre-owned)", "brand": "Zenith", "model": "Zenith DEFY Skyline C.X Ceramic Edition (Pre-owned)", "reference": "—", "price_usd": 15000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "High-Tech Ceramic", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/PB210230-2.jpg?v=1763862204", "detail_url": "https://mostexpensivewatches.net/listing/h_8379639464115", "buy_url": "https://mostexpensivewatches.net/out/h_8379639464115", "available": false}, {"id": "h_8386875031731", "title": "Zenith Zenith DEFY Skyline C.X Ceramic Edition (Pre-owned)", "brand": "Zenith", "model": "Zenith DEFY Skyline C.X Ceramic Edition (Pre-owned)", "reference": "—", "price_usd": 13500.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "High-Tech Ceramic", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Chronograph"], "merchant_slug": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/P1011937.jpg?v=1776800886", "detail_url": "https://mostexpensivewatches.net/listing/h_8386875031731", "buy_url": "https://mostexpensivewatches.net/out/h_8386875031731", "available": false}, {"id": "h_8091344011443", "title": "Zenith Zenith DEFY Skyline C.X for Collective (Sold Out)", "brand": "Zenith", "model": "Zenith DEFY Skyline C.X for Collective (Sold Out)", "reference": "—", "price_usd": 12300.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 41.0, "movement": "Automatic", "complications": [], "merchant_slug": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/CXSquare.001_6c2b43db-180e-4e44-95ee-7570c4933453.jpg?v=1731953968", "detail_url": "https://mostexpensivewatches.net/listing/h_8091344011443", "buy_url": "https://mostexpensivewatches.net/out/h_8091344011443", "available": false}, {"id": "h_7004910321843", "title": "Zenith Zenith El Primero C.01 (Pre-owned) - 07/50", "brand": "Zenith", "model": "Zenith El Primero C.01 (Pre-owned) - 07/50", "reference": "—", "price_usd": 9800.0, "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": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/products/Zenith_C01_Shop.jpg?v=1646256456", "detail_url": "https://mostexpensivewatches.net/listing/h_7004910321843", "buy_url": "https://mostexpensivewatches.net/out/h_7004910321843", "available": false}, {"id": "h_7548373041331", "title": "Zenith Zenith El Primero C.01 (Pre-owned) - 01/50", "brand": "Zenith", "model": "Zenith El Primero C.01 (Pre-owned) - 01/50", "reference": "—", "price_usd": 7800.0, "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": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/Zenith_C01_Shop_b9583947-c593-48fc-9598-bbf175382986.jpg?v=1699630559", "detail_url": "https://mostexpensivewatches.net/listing/h_7548373041331", "buy_url": "https://mostexpensivewatches.net/out/h_7548373041331", "available": false}, {"id": "h_7480231723187", "title": "Zenith Zenith El Primero C.01 (Pre-owned) - 35/50", "brand": "Zenith", "model": "Zenith El Primero C.01 (Pre-owned) - 35/50", "reference": "—", "price_usd": 7600.0, "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": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/Zenith_C01_Shop_b398c158-c00d-4ec4-8ab6-5872307d9307.jpg?v=1692124370", "detail_url": "https://mostexpensivewatches.net/listing/h_7480231723187", "buy_url": "https://mostexpensivewatches.net/out/h_7480231723187", "available": false}, {"id": "h_7465058828467", "title": "Zenith Zenith El Primero C.01 (Pre-owned) - 23/50", "brand": "Zenith", "model": "Zenith El Primero C.01 (Pre-owned) - 23/50", "reference": "—", "price_usd": 7500.0, "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": "collective-horology", "merchant_name": "Collective Horology", "image_url": "https://cdn.shopify.com/s/files/1/0559/0623/8643/files/Zenith_C01_Shop_04fbdfda-62d4-46f5-bfe2-f9eae30f311c.jpg?v=1689112655", "detail_url": "https://mostexpensivewatches.net/listing/h_7465058828467", "buy_url": "https://mostexpensivewatches.net/out/h_7465058828467", "available": false}, {"id": "h_7581195567283", "title": "Zenith Zenith El Primero Chronomaster C.01 (Pre-owned) - 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