{"reference": {"slug": "mb-f-hm4-thunderbolt-titanium", "brand": "MB&F", "ref": "HM4", "model": "HM4 Thunderbolt", "case_material": "Titanium", "url": "https://mostexpensivewatches.net/reference/mb-f-hm4-thunderbolt-titanium", "description": "The MB&F HM4 Thunderbolt was produced between 2010 and 2013, with the original titanium edition limited to 100 pieces. Collectors prioritize this reference for its unconventional aviation-inspired architecture, featuring two parallel jet-turbine pods crafted from Grade 5 titanium and a central sapphire section that requires over 185 hours of machining. The manual-wind HM4 engine consists of 311 components, utilizing two mainspring barrels to drive separate pods for time display and power reserve. This model marked a shift for the brand toward three-dimensional kinetic sculpture rather than traditional watch shapes. On the secondary market, the HM4 Thunderbolt typically trades in the low-to-mid six-figure range, often between $250,000 and $350,000 depending on condition. A notable variant is the HM4 \"Razzle Dazzle,\" which features hand-painted nose art on the titanium fuselage, further increasing its scarcity and value among specialized collectors."}, "listing_stats": {"count": 1, "median": 98000.0, "low": 98000.0, "high": 98000.0, "brands": 1, "merchants": 1}, "listings": [{"id": "h_7435399299155", "title": "MB&F HM4 Thunderbolt | Titanium", "brand": "MB&F", "model": "HM4 Thunderbolt | Titanium", "reference": "COHTI_M2057", "price_usd": 98000.0, "currency": "USD", "condition": "excellent", "box_papers": "full_set", "year": null, "case_material": "Grade 5 Titanium", "case_size_mm": 40.0, "movement": "Automatic", "complications": [], "merchant_slug": "a-collected-man", "merchant_name": "A Collected Man", "image_url": "https://cdn.shopify.com/s/files/1/0606/5325/files/MB_F_HM4_Thunderbolt__titanium_A_Collected_Man_London_Thumbnail_00_1.jpg?v=1725454951", "detail_url": "https://mostexpensivewatches.net/listing/h_7435399299155", "buy_url": "https://mostexpensivewatches.net/out/h_7435399299155", "available": false}], "auction_lots": [{"slug": "mbf-hm4-thunderbolt", "brand": "MB&F", "reference": "HM4", "model": "Horological Machine N°4 Thunderbolt", "case_material": "18k Yellow Gold + Titanium", "hammer_usd": 285000, "year_sold": 2024, "venue": "Phillips New York", "lot_summary": "Twin-engine architecture inspired by jet turbine. 311 components. Limited to 100 pieces.", "url": "https://mostexpensivewatches.net/auctions/mbf-hm4-thunderbolt"}, {"slug": "mb-f-hm4-thunderbolt-2024", "brand": "MB&F", "reference": "HM4 Thunderbolt", "model": "Horological Machine No. 4 'Thunderbolt'", "case_material": "Titanium", "hammer_usd": 147756, "year_sold": 2024, "venue": "Bonhams Hong Kong", "lot_summary": "An aviation-inspired machine with dual jet-turbine pods for time and power reserve displays.", "source_url": "https://www.bonhams.com/stories/33945/", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/mb-f-hm4-thunderbolt-2024"}, {"slug": "mb-f-hm4-thunderbolt-2017", "brand": "MB&F", "reference": "HM4 Thunderbolt", "model": "Horological Machine No. 4 Thunderbolt", "case_material": "Titanium", "hammer_usd": 147435, "year_sold": 2017, "venue": "Sotheby's Hong Kong", "lot_summary": "An early example of the aviation-inspired HM4, featuring a three-dimensional horological engine with twin mainspring barrels and 311 components.", "source_url": "https://www.sothebys.com/en/auctions/ecatalogue/2017/important-watches-hk0743/lot.2326.html", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/mb-f-hm4-thunderbolt-2017"}]}