{"reference": {"slug": "mb-f-hm2-sapphire-titanium", "brand": "MB&F", "ref": "HM2", "model": "Horological Machine No. 2", "case_material": "Sapphire and Titanium", "url": "https://mostexpensivewatches.net/reference/mb-f-hm2-sapphire-titanium", "description": "The MB&F Horological Machine No. 2 (HM2) Sapphire Vision (SV) in titanium was produced between 2008 and 2011 as part of the brand’s early experimental era. Collectors target this reference for its complex architectural case, which features a transparent sapphire crystal top plate secured by a titanium base and a distinctive rubber gasket system. The watch utilizes the HM2 engine, a Jean-Marc Wiederrecht-designed movement built on a Girard-Perregaux base, featuring the world’s first mechanical movement combining instantaneous jumping hours, concentric retrograde minutes, retrograde date, and a bi-hemisphere moon phase. This specific variant was limited to 25 pieces, contributing to its scarcity. On the secondary market, the HM2 SV titanium typically trades in the $50,000 to $80,000 range depending on condition and provenance. A notable production detail is the use of over 100 components in the case construction alone to ensure water resistance despite the modular sapphire design."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "mb-f-hm2-sv-2018", "brand": "MB&F", "reference": "HM2-SV", "model": "Horological Machine No. 2 Sapphire Vision", "case_material": "Sapphire and Titanium", "hammer_usd": 45000, "year_sold": 2018, "venue": "Christie's Hong Kong", "lot_summary": "One of the first MB&F watches to feature a full sapphire crystal top plate, offering a clear view of the complex HM2 movement.", "source_url": "https://www.christies.com/en/lot/lot-6144574", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/mb-f-hm2-sv-2018"}]}