{"listing": {"id": "h_15751357923673", "title": "IWC IWC Da Vinci Perpetual Calendar Chrono Yellow Gold Reference 3750", "brand": "IWC", "model": "IWC Da Vinci Perpetual Calendar Chrono Yellow Gold Reference 3750", "reference": "3750", "price_usd": 8900.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Yellow Gold", "case_size_mm": 38.0, "movement": "Automatic", "complications": ["Perpetual Calendar", "Chronograph"], "merchant_slug": "bulang-and-sons", "merchant_name": "Bulang & Sons", "image_url": "https://cdn.shopify.com/s/files/1/0961/8613/8969/files/W-1586IWCDaVinciin18kYellowGold_012_1x1_1c3206f3-b8b8-4a3d-bc52-b4d3ebce3d86.jpg?v=1756205686", "detail_url": "https://mostexpensivewatches.net/listing/h_15751357923673", "buy_url": "https://mostexpensivewatches.net/out/h_15751357923673", "available": false}, "lang": "en", "url": "https://mostexpensivewatches.net/listing/h_15751357923673", "alternatives_url": "https://mostexpensivewatches.net/api/v1/listing/h_15751357923673/alternatives", "lower_priced": [], "similar_listings": [], "cohort": {"count": 1, "median": 8900.0, "low": 8900.0, "high": 8900.0, "brands": 1, "merchants": 1, "listing_price": 8900.0, "position": "median", "delta_vs_median_pct": 0.0}, "reference": {"slug": "iwc-3750", "ref": "3750", "brand": "IWC", "model": "Da Vinci Perpetual Calendar", "url": "https://mostexpensivewatches.net/reference/iwc-3750", "alternatives_url": "https://mostexpensivewatches.net/api/alternatives/iwc-3750"}, "cross_reference_alternatives": [{"reference": {"slug": "iwc-iw5022-18", "brand": "IWC", "ref": "IW5022-18", "model": "Portugieser Perpetual Calendar", "case_material": "18k White Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-iw5022-18", "description": "The IWC Portugieser Perpetual Calendar reference IW5022-18 was produced between approximately 2006 and 2010. This reference is valued by collectors for its 42.3mm 18k white gold case and the caliber 51613 movement, which features Kurt Klaus’s synchronized calendar module and a seven-day power reserve. Unlike later 44mm versions, the IW5022 maintains a more traditional diameter and utilizes a single moon phase display at 12 o’clock rather than the double hemisphere moon. The dial is finished in Ardoise grey with applied Arabic numerals. On the secondary market, this reference typically trades between $18,000 and $24,000 depending on condition and the presence of original documentation. A notable production detail is that this reference belongs to the first generation of Portugieser Perpetual Calendars to transition from the earlier 40mm 3541 reference to the modern Pellaton-winding manufacture movements."}, "score": 24, "why_compare": "Same iwc collector universe; shared search intent: 18k, calendar; similar gold case profile.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/iwc-iw5022-18", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-iw5022-18"}, {"reference": {"slug": "iwc-3751", "brand": "IWC", "ref": "3751", "model": "Da Vinci Rattrapante", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-3751", "description": "The IWC Da Vinci Rattrapante reference 3751 was produced from approximately 1995 through the early 2000s and is no longer in production. Collectors value this reference for its integration of a perpetual calendar and a split-seconds chronograph within a 39mm 18k yellow gold case featuring hinged lugs. It utilizes the caliber 79251, which is based on a Valjoux 7750 modified with Richard Habring’s simplified rattrapante module and Kurt Klaus’s synchronized calendar system. The dial includes a four-digit year indicator, a moon phase, and four sub-dials. On the secondary market, this reference typically trades between $12,000 and $18,000 depending on the presence of the original box and papers. A notable production detail is that the perpetual calendar is programmed to function until 2499, though the century slide must be replaced by a watchmaker when the year 2100 arrives."}, "score": 20, "why_compare": "Same iwc collector universe; shared search intent: 18k, gold; similar gold case profile.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/iwc-3751", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-3751"}, {"reference": {"slug": "iwc-9225", "brand": "IWC", "ref": "9225", "model": "Ingenieur", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-9225", "description": "The IWC Ingenieur reference 9225 is an 18k yellow gold timepiece produced during the mid-to-late 1980s as part of the \"Skinny\" Ingenieur generation. Collectors value this reference for its 34mm Gérald Genta-inspired case design and its use of the ultra-thin caliber 2102, a quartz movement based on the ETA 210 series. This specific reference is noted for its integrated solid gold bracelet and the \"SL\" branding on the dial, signifying its lineage within the Steel Line heritage despite its precious metal construction. Due to low production volumes for solid gold variants during this era, the 9225 is relatively rare compared to its steel counterparts. On the secondary market, prices typically range from $12,000 to $18,000 depending on bracelet stretch and the presence of original documentation. A notable production detail is the use of a screw-down crown and sapphire crystal, maintaining the line's technical specifications."}, "score": 20, "why_compare": "Same iwc collector universe; shared search intent: 18k, gold; similar gold case profile.", "listing_stats": {"count": 12, "median": 6325.0, "low": 3000.0, "high": 18000.0, "brands": 1, "merchants": 4}, "top_listing": {"id": "h_16292299047257", "title": "IWC IWC Ingenieur Automatic SL Khanjar Dial ref 3505 Steel and Gold Execution", "brand": "IWC", "model": "IWC Ingenieur Automatic SL Khanjar Dial ref 3505 Steel and Gold Execution", "reference": "3505", "price_usd": 10250.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "bulang-and-sons", "merchant_name": "Bulang & Sons", "image_url": "https://cdn.shopify.com/s/files/1/0961/8613/8969/files/W-3752IWCIngenieurAutomaticSLKhanjardial_283_1x1_38b36e15-b18c-46b8-b1f1-017a8a7f92ce.jpg?v=1778224443", "detail_url": "https://mostexpensivewatches.net/listing/h_16292299047257", "buy_url": "https://mostexpensivewatches.net/out/h_16292299047257", "available": true}, "auction_comp_count": 2, "review_url": "https://mostexpensivewatches.net/review/iwc-9225", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-9225"}, {"reference": {"slug": "iwc-iw5036-05", "brand": "IWC", "ref": "IW5036-05", "model": "Big Pilot's Watch Perpetual Calendar", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-iw5036-05", "description": "The IWC Big Pilot’s Watch Perpetual Calendar reference IW5036-05 was introduced in 2021 as a core collection model and remains in current production. This reference is distinguished by its combination of a 46.2mm stainless steel case and a sunray-finished blue dial, a pairing previously reserved for limited editions like the \"Le Petit Prince\" series. It utilizes the IWC-manufactured caliber 52615, an automatic movement featuring a Pellaton winding system, ceramic components, and a seven-day power reserve via twin barrels. The perpetual calendar complication, originally engineered by Kurt Klaus, displays the date, day, month, and year in four digits, alongside a double moon phase for both hemispheres. On the secondary market, this reference typically trades between $22,000 and $28,000. While not a limited production, it represents the first time this specific blue and steel configuration entered the permanent Big Pilot catalog without boutique-exclusive branding."}, "score": 19, "why_compare": "Same iwc collector universe; shared search intent: calendar, iwc.", "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "top_listing": null, "auction_comp_count": 2, "review_url": "https://mostexpensivewatches.net/review/iwc-iw5036-05", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-iw5036-05"}, {"reference": {"slug": "iwc-iw502709", "brand": "IWC", "ref": "IW502709", "model": "Big Pilot Antoine de Saint Exupéry'", "case_material": "18k White Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-iw502709", "description": "The IWC Big Pilot’s Watch Annual Calendar Edition “Antoine de Saint Exupéry” reference IW502709 was released in 2016 as a limited edition of 250 pieces and is no longer in production. This reference is distinguished by its 46.2mm case constructed from 18k white gold and a tobacco brown sunray-brushed dial featuring an annual calendar complication that displays the month, date, and day in three separate windows. It is powered by the IWC-manufactured caliber 52850, an automatic movement with a seven-day power reserve and a solid 18k gold rotor shaped like a Lockheed P-38 Lightning. On the secondary market, this reference typically trades between $22,000 and $30,000 depending on condition and the presence of original documentation. A notable production detail is the sapphire case back which showcases the specialized rotor, a design specific to the Saint Exupéry series within the Big Pilot line."}, "score": 18, "why_compare": "Same iwc collector universe; shared search intent: 18k, gold; similar gold case profile.", "listing_stats": {"count": 1, "median": 11600.0, "low": 11600.0, "high": 11600.0, "brands": 1, "merchants": 1}, "top_listing": {"id": "h_6894016921675", "title": "IWC IWC Big Pilot Spitfire Annual Calendar IW5027-02", "brand": "IWC", "model": "IWC Big Pilot Spitfire Annual Calendar IW5027-02", "reference": "IW5027", "price_usd": 11600.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Annual Calendar"], "merchant_slug": "hodinkee", "merchant_name": "Hodinkee Shop", "image_url": "https://cdn.shopify.com/s/files/1/0146/0732/products/IWC-Big-Pilot-Spitfire-IW5027-02-10-10-IWC-1VC4QS-7893e2db5bf4.jpg?v=1710687346", "detail_url": "https://mostexpensivewatches.net/listing/h_6894016921675", "buy_url": "https://mostexpensivewatches.net/out/h_6894016921675", "available": false}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/iwc-iw502709", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-iw502709"}, {"reference": {"slug": "iwc-iw502704", "brand": "IWC", "ref": "IW502704", "model": "Big Pilot Le Petit Prince' Only Watch", "case_material": "18k Red Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-iw502704", "description": "The IWC Big Pilot’s Watch Annual Calendar Edition “Le Petit Prince” reference IW502704 is a unique piece manufactured in 2016 specifically for the Only Watch charity auction. This reference is distinguished by its 46.2mm case constructed from 18k red gold and a midnight blue sunray-brushed dial featuring an annual calendar complication. It houses the manufacture caliber 52850, which provides a seven-day power reserve. Collectors value this specific watch for its unique movement execution; the solid gold oscillating weight is sandblasted and shaped to depict the Little Prince standing on an asteroid. As a unique piece, it does not have a standard secondary market price range, though it sold at the 2016 Christie’s Only Watch auction for 38,000 CHF. It remains the only example of this reference ever produced, marking a significant entry in the brand’s partnership with the Antoine de Saint-Exupéry Youth Foundation."}, "score": 18, "why_compare": "Same iwc collector universe; shared search intent: 18k, gold; similar gold case profile.", "listing_stats": {"count": 1, "median": 11600.0, "low": 11600.0, "high": 11600.0, "brands": 1, "merchants": 1}, "top_listing": {"id": "h_6894016921675", "title": "IWC IWC Big Pilot Spitfire Annual Calendar IW5027-02", "brand": "IWC", "model": "IWC Big Pilot Spitfire Annual Calendar IW5027-02", "reference": "IW5027", "price_usd": 11600.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Stainless Steel", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Annual Calendar"], "merchant_slug": "hodinkee", "merchant_name": "Hodinkee Shop", "image_url": "https://cdn.shopify.com/s/files/1/0146/0732/products/IWC-Big-Pilot-Spitfire-IW5027-02-10-10-IWC-1VC4QS-7893e2db5bf4.jpg?v=1710687346", "detail_url": "https://mostexpensivewatches.net/listing/h_6894016921675", "buy_url": "https://mostexpensivewatches.net/out/h_6894016921675", "available": false}, "auction_comp_count": 1, "review_url": "https://mostexpensivewatches.net/review/iwc-iw502704", "alternatives_url": "https://mostexpensivewatches.net/alternatives/iwc-iw502704"}]}