{"query": "521", "brand": null, "total": 6, "limit": 10, "matches": [{"slug": "hublot-521", "brand": "Hublot", "ref": "521", "model": "Classic Fusion Chronograph", "case_material": "Titanium", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/hublot-521", "description": "The Hublot Classic Fusion Chronograph 521.NX.1171.RX is a core component of the brand’s contemporary catalog, having remained in steady production since the early 2010s. Collectors evaluate this reference based on its 45mm Grade 5 titanium case, which offers a high strength-to-weight ratio and a more muted aesthetic compared to the brand's Big Bang series. It utilizes the HUB1143 caliber, an automatic movement based on the ETA 2892-A2 with a Dubois-Dépraz chronograph module, providing a 42-hour power reserve. The dial features a symmetrical bi-compax layout with a date window at six o'clock. On the secondary market, this reference typically trades between $6,000 and $8,500 depending on condition and inclusion of original documentation. A notable production variant is the \"Racing Grey\" edition, which replaces the standard matte black dial with a sunray-finished grey surface, often commanding a slight premium.", "score": 198}, {"slug": "audemars-piguet-15210bc-code-11-59-selfwinding", "brand": "Audemars Piguet", "ref": "15210BC.OO.A002KB.01", "model": "Code 11.59 Selfwinding", "case_material": "18k White Gold", "url": "https://mostexpensivewatches.net/reference/audemars-piguet-15210bc-code-11-59-selfwinding", "description": "The Audemars Piguet Code 11.59 Selfwinding reference 15210BC.OO.A002KB.01 was introduced in 2019 as part of the collection’s initial launch and remains in production. This reference features an 18k white gold case with a complex three-piece architecture, including an octagonal middle case and a double-curved sapphire crystal. It is powered by the in-house Calibre 4302, an automatic movement providing a 70-hour power reserve. The dial is finished in black lacquer with white gold applied hour-markers and hands. Collectors monitor this reference as a foundational piece of the brand’s modern non-Royal Oak strategy. On the secondary market, this specific model typically trades between $22,000 and $28,000, representing a significant depreciation from its original retail price. While the lacquer dial was the standard launch configuration, the collection has since evolved to include smoked and embossed dial variants, making these early monochromatic versions distinct.", "score": 83}, {"slug": "panerai-5218-301", "brand": "Panerai", "ref": "5218-301", "model": "Mare Nostrum", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/panerai-5218-301", "description": "The Panerai Mare Nostrum reference 5218-301 was produced between 1993 and 1996 during the brand’s Pre-Vendôme era. Collectors prioritize this reference as the first civilian chronograph released by Panerai, based on a 1943 prototype. The watch features a 42mm brushed stainless steel case with a fixed tachymeter bezel and a modular ETA 2801-2 movement with a Dubois-Dépraz 3127 chronograph caliber. The dial is navy blue with two sub-dials and tritium-based luminous markers. Production was limited, with approximately 492 units completed out of an initial intended run of 1,000. On the secondary market, these timepieces typically trade between $15,000 and $25,000 depending on the presence of the original mahogany box and paperwork. A notable variant is the \"Slytech\" edition, reference 5218-302/304, which was customized for actor Sylvester Stallone and features distinct dial branding and a higher market premium.", "score": 83}, {"slug": "panerai-6152-1", "brand": "Panerai", "ref": "6152-1", "model": "Luminor Marina Militare", "case_material": "Stainless Steel", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/panerai-6152-1", "description": "The Panerai Luminor Marina Militare reference 6152-1 was produced during the 1950s and 1960s for the Italian Navy and is no longer in production. Collectors value this reference for its transitional role in Panerai history, specifically the introduction of the patented crown-protecting bridge and the shift from Radiomir to tritium-based Luminor luminous material. The 47mm stainless steel case features a monoblock construction with integrated lugs and typically houses the Rolex Caliber 618 manual-wind movement. Rarity is high, as these were military-issued instruments rather than commercial products. On the secondary market, prices generally fall within the $80,000 to $150,000 range depending on provenance and dial configuration. A notable variant includes examples fitted with the Angelus SF 240 eight-day movement, which command higher premiums at auction, sometimes exceeding $200,000, due to their increased technical complexity and limited production numbers.", "score": 83}, {"slug": "patek-philippe-5212a-calatrava-weekly-calendar", "brand": "Patek Philippe", "ref": "5212A-001", "model": "Calatrava Weekly Calendar", "case_material": "Stainless Steel", "url": "https://mostexpensivewatches.net/reference/patek-philippe-5212a-calatrava-weekly-calendar", "description": "The Patek Philippe Calatrava Weekly Calendar 5212A-001 entered production in 2019 and remains in the current catalog. This reference is notable for its 40mm case constructed from stainless steel, a metal rarely used in the Calatrava collection. It features a silvery opaline dial with a unique five-hand layout and typography based on the handwriting of one of the brand's designers. The watch houses the self-winding caliber 26-330 S C J SE, which includes a semi-integrated mechanism for displaying the day, date, and week number. Collectors value this model for its unusual complication and its departure from traditional dress watch aesthetics. On the secondary market, prices typically range between $30,000 and $40,000. A production note of interest is that the 5212A introduced the caliber 26-330, which featured technical optimizations like a hacking seconds function and a redesigned winding system subsequently rolled out to other major references.", "score": 83}, {"slug": "roger-dubuis-rddbex0252", "brand": "Roger Dubuis", "ref": "RDDBEX0252", "model": "Excalibur Skeletonised Double Tourbillon", "case_material": "18k White Gold", "provenance": "extracted_from_auction_comps", "url": "https://mostexpensivewatches.net/reference/roger-dubuis-rddbex0252", "description": "The Roger Dubuis Excalibur Skeletonised Double Tourbillon reference RDDBEX0252 was introduced around 2010 and is no longer in current production. Collectors target this reference for the Calibre RD01SQ, a hand-wound movement featuring two flying tourbillons linked by a differential to average their rates for improved chronometric precision. The 45mm case is constructed from 18k white gold and features the signature Excalibur triple lugs and notched bezel. This model holds historical significance as a representation of the brand’s Poinçon de Genève certification, requiring every component to be finished to specific artisanal standards. On the secondary market, this reference typically trades in the $100,000 to $140,000 range depending on condition and provenance. While the RDDBEX0252 is the standard white gold iteration, a notable variant includes the RDDBEX0250, which utilizes the same skeletonized architecture but is housed in an 18k rose gold case.", "score": 71}]}