{"query": "HM2-SV", "brand": null, "total": 6, "limit": 10, "matches": [{"slug": "mb-f-hm2-sv", "brand": "MB&F", "ref": "HM2-SV", "model": "Horological Machine No. 2 Sapphire Vision", "case_material": "Sapphire and Titanium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/mb-f-hm2-sv", "description": "The MB&F Horological Machine No. 2 Sapphire Vision (HM2-SV) in sapphire and titanium was released in 2010 as a limited edition of 25 pieces, following the original HM2 launch in 2008. Collectors value this reference for its complex case construction, which features a solid sapphire crystal plate secured to a titanium base by a patented gasket system and 22 bolts. The Jean-Marc Wiederrecht-designed caliber utilizes a Girard-Perregaux base with a jumping hour, concentric retrograde minutes, and a retrograde date across twin dials. This model represents a pivotal era in the brand’s history as the first to utilize a full sapphire top plate to reveal the movement architecture. On the secondary market, the HM2-SV typically trades in the $60,000 to $90,000 range. A notable production detail is that the sapphire plate required over 55 hours of machining and polishing to achieve its final dimensions.", "score": 205}, {"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.", "score": 35}, {"slug": "longines-13zn-vintage-chronograph-gold", "brand": "Longines", "ref": "13ZN", "model": "Vintage Chronograph 13ZN", "case_material": "18k Yellow Gold", "url": "https://mostexpensivewatches.net/reference/longines-13zn-vintage-chronograph-gold", "description": "The Longines 13ZN chronograph was produced from 1936 until approximately 1947. Collectors prioritize this reference for its 13ZN caliber, which was the first serially produced wristwatch movement to feature a flyback function. In 18k yellow gold, the watch typically features a multi-step bezel or a \"tre tacche\" case construction with a diameter ranging from 34mm to 38mm. Dial configurations often include tachymeter or telemeter scales in enamel or silvered finishes. Due to the movement's technical complexity and the brand's transition to outsourced calibers later in the century, these pieces are considered significant historical artifacts. Current secondary market prices for 18k yellow gold examples generally range from $25,000 to over $100,000 depending on case size and dial originality. A notable 1940s oversized 38mm yellow gold variant reached a hammer price of approximately $120,000 at a major 2022 auction.", "score": 8}, {"slug": "mb-f-60", "brand": "MB&F", "ref": "60", "model": "Horological Machine No. 6 Sapphire Vision (HM6-SV)", "case_material": "Platinum and Sapphire Crystal", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/mb-f-60", "description": "The MB&F Horological Machine No. 6 Sapphire Vision (HM6-SV) in platinum was released in 2016 as a limited edition of 10 pieces, marking the final evolution of the HM6 \"Space Pirate\" series which concluded production in 2019. Collectors prioritize this reference for its complex case construction, featuring two plates of solid sapphire crystal sandwiching a platinum center streamliner. The movement, a three-dimensional caliber developed with David Candaux, consists of 475 components and features a 60-second flying tourbillon protected by a retractable semi-spherical titanium shield. Functional details include twin aluminum turbines that regulate the automatic winding system to prevent excessive wear. On the secondary market, the HM6-SV typically commands prices in the mid-to-high six-figure range, often between $350,000 and $500,000 depending on provenance. A notable production detail is that only 100 total movements were manufactured across all HM6 variants, ensuring permanent scarcity for the series.", "score": 8}, {"slug": "vacheron-constantin-7810s", "brand": "Vacheron Constantin", "ref": "7810S", "model": "Harmony Dual Time", "case_material": "18k White Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/vacheron-constantin-7810s", "description": "The Vacheron Constantin Harmony Dual Time reference 7810S/000G-B050 was released in 2015 as a limited edition of 625 pieces to commemorate the manufacture’s 260th anniversary. It is no longer in production. Collectors value this reference for its cushion-shaped 18k white gold case, which measures 40mm by 49.3mm, and its use of the manufacture caliber 2460DT. This self-winding movement features a second time zone sub-dial at 4 o’clock and a day-night indicator at 8 o’clock, all adjustable via the crown. The silvered opaline dial includes blue painted Arabic numerals and leaf-shaped hands. A distinguishing feature of this anniversary edition is the balance cock, which is hand-engraved with a scrolling \"fleurisanne\" motif inspired by a 1755 pocket watch. On the secondary market, this reference typically trades between $25,000 and $35,000. A smaller 37mm version set with diamonds, reference 7805S, was produced concurrently for women.", "score": 8}, {"slug": "voutilainen-217qrs", "brand": "Voutilainen", "ref": "217QRS", "model": "Retrograde Date 217QRS", "case_material": "Platinum", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/voutilainen-217qrs", "score": 8}]}