{"reference": {"slug": "iwc-3770", "brand": "IWC", "ref": "3770", "model": "Grande Complication", "case_material": "Platinum", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/iwc-3770", "description": "The IWC Grande Complication reference 3770 in platinum was produced between 1990 and approximately 2005. This reference is significant for being the first wristwatch to integrate a perpetual calendar, chronograph, and minute repeater into a single movement, the caliber 79091. Based on a Valjoux 7750 architecture, the movement features a Kurt Klaus-designed calendar module that is synchronized via the crown. The platinum case measures 42.2mm in diameter and houses a solid silver dial with four sub-dials and a moon phase indicator. Production was limited to 50 pieces per year, contributing to its scarcity. On the secondary market, the reference 3770 in platinum typically trades between $80,000 and $120,000 depending on condition and provenance. A notable production detail is the inclusion of a slide on the left case flank to activate the minute repeater, which utilizes two gongs to chime hours, quarters, and minutes."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "iwc-3770-2013", "brand": "IWC", "reference": "3770", "model": "Grande Complication", "case_material": "Platinum", "hammer_usd": 126000, "year_sold": 2013, "venue": "Christie's New York", "lot_summary": "A rare platinum example of the Grande Complication, one of the most complex production watches of the 1990s.", "source_url": "https://www.christies.com/en/lot/lot-5691234", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/iwc-3770-2013"}, {"slug": "iwc-3770-25-2026", "brand": "IWC", "reference": "3770-25", "model": "Grande Complication", "case_material": "18k Pink Gold", "hammer_usd": 105000, "year_sold": 2026, "venue": "Phillips Geneva", "lot_summary": "A limited edition minute repeating perpetual calendar chronograph, numbered 49 of 50 pieces produced.", "source_url": "https://www.phillips.com/detail/iwc/CH080126/139", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/iwc-3770-25-2026"}, {"slug": "iwc-3770-2022", "brand": "IWC", "reference": "3770", "model": "Grande Complication", "case_material": "Platinum", "hammer_usd": 74800, "year_sold": 2022, "venue": "Christie's Geneva", "lot_summary": "A flagship complication featuring 18 functions including a minute repeater and perpetual calendar, limited to 50 pieces in platinum.", "source_url": "https://www.christies.com/en/lot/lot-6371542", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/iwc-3770-2022"}]}