{"reference": {"slug": "mb-f-55r339", "brand": "MB&F", "ref": "55R339", "model": "Horological Machine No. 5 (HM5)", "case_material": "18k Red Gold and Titanium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/mb-f-55r339", "description": "The MB&F Horological Machine No. 5 (HM5) RT, reference 55.RTL.B, was released in 2013 as a limited edition of 66 pieces. This reference features an outer case constructed from 18k red gold and grade 5 titanium, housing an internal water-resistant engine container. The movement is a Girard-Perregaux based caliber modified by Jean-François Mojon and Vincent Boucard, featuring a 22k gold battle-axe rotor and a jumping hour mechanism. Time is displayed via bi-directional jumping hours and minutes on sapphire crystal discs, which are projected 90 degrees vertically through an optical grade sapphire prism. The case design includes functional louvers operated by a slide to allow light to charge the Super-LumiNova on the discs. On the secondary market, this reference typically trades between $55,000 and $75,000. It followed the original 2012 zirconium version and preceded the final CarbonMacrolon edition, marking a significant material evolution in the HM5 series."}, "listing_stats": {"count": 0, "median": 0, "low": 0, "high": 0}, "listings": [], "auction_lots": [{"slug": "mb-f-55r339-2023", "brand": "MB&F", "reference": "55R339", "model": "Horological Machine No. 5 (HM5)", "case_material": "18k Red Gold and Titanium", "hammer_usd": 40320, "year_sold": 2023, "venue": "Christie's Dubai", "lot_summary": "A rare driver's watch inspired by 1970s supercars, featuring a bi-directional jumping hour display and a gold/titanium case.", "source_url": "https://www.christies.com/en/lot/lot-6444574", "provenance": "ai_generated_grounded", "url": "https://mostexpensivewatches.net/auctions/mb-f-55r339-2023"}]}