{"reference": {"slug": "greubel-forsey-invention", "brand": "Greubel Forsey", "ref": "INVENTION", "model": "Invention Piece 2", "case_material": "Platinum", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/greubel-forsey-invention", "description": "The Greubel Forsey Invention Piece 2 was introduced in 2011 as a limited edition of 22 pieces, with 11 units cased in platinum and 11 in 5N red gold. This reference is no longer in production. Collectors prioritize this model for its unique movement architecture, which features two Quadruple Tourbillon systems coupled by a spherical differential. The caliber consists of 594 components, including four asynchronous tourbillons designed to average out positional errors. The dial lacks a traditional face, instead utilizing a sub-dial at 5 o'clock for hours and minutes, a small seconds disc at 10 o'clock, and a 56-hour power reserve indicator at 11 o'clock. On the secondary market, these timepieces typically command prices in the mid-to-high six-figure range, often between $450,000 and $650,000. A notable auction result occurred in 2021 when a platinum example sold for approximately $500,000 at Christie’s."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "greubel-forsey-invention-piece-2-2024", "brand": "Greubel Forsey", "reference": "Invention Piece 2", "model": "Invention Piece 2", "case_material": "Platinum", "hammer_usd": 423395, "year_sold": 2024, "venue": "Christie's Hong Kong", "lot_summary": "A platinum limited edition of 11 pieces featuring a differential quadruple tourbillon and a unique asymmetrical case design.", "source_url": "https://www.christies.com/en/lot/lot-6483903", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-invention-piece-2-2024"}, {"slug": "greubel-forsey-invention-piece-1-2021", "brand": "Greubel Forsey", "reference": "Invention Piece 1", "model": "Invention Piece 1", "case_material": "18k White Gold", "hammer_usd": 391000, "year_sold": 2021, "venue": "Christie's Geneva", "lot_summary": "A white gold limited edition of 11 pieces, this Invention Piece 1 features a personalized message from the founders on the case back.", "source_url": "https://www.christies.com/en/lot/lot-6483906", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-invention-piece-1-2021"}, {"slug": "greubel-forsey-invention-piece-1-2023", "brand": "Greubel Forsey", "reference": "Invention Piece 1", "model": "Invention Piece 1", "case_material": "18k White Gold", "hammer_usd": 268111, "year_sold": 2023, "venue": "Phillips Geneva", "lot_summary": "Number 7 of a limited edition of 11 pieces, this watch showcases the Double Tourbillon 30° with a unique architectural dial layout.", "source_url": "https://www.phillips.com/detail/greubel-forsey/CH080223/130", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-invention-piece-1-2023"}, {"slug": "greubel-forsey-invention-piece-1-2016", "brand": "Greubel Forsey", "reference": "Invention Piece 1", "model": "Invention Piece 1", "case_material": "18k White Gold", "hammer_usd": 225806, "year_sold": 2016, "venue": "Phillips Hong Kong", "lot_summary": "A tribute to the brand's first invention, the Double Tourbillon 30°, featuring a unique retrograde-style time display and limited to 11 pieces in white gold.", "source_url": "https://www.phillips.com/detail/greubel-forsey/HK080216/1103", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/greubel-forsey-invention-piece-1-2016"}]}