{"reference": {"slug": "vacheron-constantin-43031", "brand": "Vacheron Constantin", "ref": "43031", "model": "Patrimony Perpetual Calendar", "case_material": "18k Yellow Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/vacheron-constantin-43031", "description": "The Vacheron Constantin reference 43031 in 18k yellow gold was produced from approximately 1983 until 2002. Collectors prioritize this reference for its ultra-thin caliber 1120/1, which utilizes a Jaeger-LeCoultre 920 base movement featuring a full-sized rotor with a beryllium rail. The 36mm case design is characterized by stepped lugs and a slim profile of roughly 7.5mm. The dial typically features \"sigma\" markings at six o'clock, indicating the use of solid gold indices, and displays the day, date, month, and moon phase without a leap year indicator. As of 2024, secondary market prices generally range between $35,000 and $55,000 depending on condition and the presence of original accessories. A notable variant includes the skeletonized reference 43032, though the 43031 remains the foundational perpetual calendar of the brand’s post-Quartz Crisis era. One example sold at Phillips in 2023 for approximately $40,000."}, "listing_stats": {"count": 9, "median": 32850.0, "low": 17650.0, "high": 90740.0, "brands": 1, "merchants": 2}, "listings": [{"id": "h_8029566435650", "title": "Vacheron Constantin Patrimony Perpetual Calendar Ultra-Thin - Collection Excellence Platine Ref. # 43175/000P-B190", "brand": "Vacheron Constantin", "model": "Patrimony Perpetual Calendar Ultra-Thin - Collection Excellence Platine Ref. # 43175/000P-B190", "reference": "43175/000P-", "price_usd": 90740.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Platinum", "case_size_mm": 41.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "watch-affinity", "merchant_name": "Watch-Affinity", "image_url": 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{"id": "h_6746369097811", "title": "Vacheron Constantin Perpetual Calendar 43031 | Yellow Gold", "brand": "Vacheron Constantin", "model": "Perpetual Calendar 43031 | Yellow Gold", "reference": "43031", "price_usd": 17650.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "18k Yellow Gold", "case_size_mm": 40.0, "movement": "Automatic", "complications": ["Perpetual Calendar"], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/products/Vacheron_Constantin_Perpetual_Calendar_43031_A_Collected_Man_London_WYG_V1430_12.jpg?v=1650375667", "detail_url": "https://mostexpensivewatches.net/listing/h_6746369097811", "buy_url": "https://mostexpensivewatches.net/out/h_6746369097811", "available": false}], "auction_lots": [{"slug": "vacheron-constantin-43031-2014", "brand": "Vacheron Constantin", "reference": "43031", "model": "Patrimony Perpetual Calendar", "case_material": "18k Yellow Gold", "hammer_usd": 13750, "year_sold": 2014, "venue": "Christie's New York", "lot_summary": "An ultra-thin automatic perpetual calendar that was a cornerstone of Vacheron Constantin's high-complication catalog for over two decades.", "source_url": "https://www.christies.com/en/lot/lot-5805018", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/vacheron-constantin-43031-2014"}]}