{"reference": {"slug": "greubel-forsey-gf05", "brand": "Greubel Forsey", "ref": "GF05", "model": "GMT Tourbillon", "case_material": "18k White Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/greubel-forsey-gf05", "description": "The Greubel Forsey GMT in 18k white gold, featuring the manual-wind caliber GF05, was introduced in 2011 and remained a cornerstone of the brand’s production until the model was phased out around 2021. Collectors prioritize this reference for its technical complexity, specifically the 24-second tourbillon inclined at 25 degrees and the rotating titanium globe that provides a visual representation of world time. The 43.5mm case utilizes an asymmetrical lateral window to display the globe from a profile view. On the secondary market, this white gold reference typically trades in the mid-to-high six-figure range, often between $300,000 and $450,000 depending on condition and provenance. A notable production detail is the limited nature of these pieces; while not a numbered limited edition in white gold, total annual output for the entire GMT line remained extremely low, often fewer than 100 units across all metals."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "greubel-forsey-gf05-2025", "brand": "Greubel Forsey", "reference": "GF05", "model": "GMT Tourbillon", "case_material": "18k White Gold", "hammer_usd": 252000, "year_sold": 2025, "venue": "Christie's New York", "lot_summary": "Features a 25° inclined 24-second tourbillon and a rotating 3D globe for world time, showcasing the brand's third fundamental invention.", "source_url": "https://www.christies.com/en/lot/lot-6483896", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-gf05-2025"}, {"slug": "greubel-forsey-gf05-2023", "brand": "Greubel Forsey", "reference": "GF05", "model": "GMT Tourbillon", "case_material": "18k White Gold", "hammer_usd": 225777, "year_sold": 2023, "venue": "Phillips Geneva", "lot_summary": "A complex world time wristwatch featuring a rotating 3D globe and a 25-degree inclined 24-second tourbillon.", "source_url": "https://www.phillips.com/detail/greubel-forsey/CH080223/59", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-gf05-2023"}]}