{"product_id":"seiko-prospex-marinemaster-1968-heritage","title":"Prospex Marinemaster 1968 Heritage Diver's Watch","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\" data-end=\"475\" data-start=\"101\"\u003eThe Seiko Prospex Marinemaster HBF001J1 marks the return of one of Seiko's most revered names in professional diving watches. Inspired by the iconic 1968 diver that helped establish Seiko as a pioneer of underwater timekeeping, this modern reinterpretation combines the unmistakable silhouette of the original with Seiko's latest mechanical movement and refined engineering.\u003cspan class=\"PDq2pG_selectionAnchor\" aria-hidden=\"true\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"859\" data-start=\"477\"\u003eDesigned as the flagship model within the Prospex collection, the Marinemaster HBF001J1 is built for serious divers while offering the refinement and comfort expected of a luxury mechanical sports watch. Featuring a satin black dial, ceramic bezel and the new Calibre 8L45, it represents the pinnacle of Seiko's mechanical dive watch expertise. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-end=\"893\" data-start=\"861\" data-section-id=\"15xt5ae\"\u003eInspired by the 1968 Original\u003c\/h2\u003e\n\u003cp data-end=\"1232\" data-start=\"895\"\u003eIn 1968, Seiko introduced Japan's first high-beat professional diver's watch, setting new standards for reliability and underwater performance. The HBF001J1 faithfully carries forward that legacy, retaining the flowing case profile, distinctive 4 o'clock crown position and purposeful design language that made the original such an icon.\u003c\/p\u003e\n\u003cp data-end=\"1709\" data-start=\"1234\"\u003eThe satin-finished black dial has been specially developed to minimise reflections beneath the water's surface, providing exceptional contrast and legibility in challenging conditions. Applied indexes with polished bevels catch the light beautifully, while generous LumiBrite application ensures outstanding visibility in darkness. A black ceramic bezel adds exceptional scratch resistance while enhancing the watch's premium appearance. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-end=\"1751\" data-start=\"1711\" data-section-id=\"htw0u1\"\u003ePowered by the New Seiko Calibre 8L45\u003c\/h2\u003e\n\u003cp data-end=\"1916\" data-start=\"1753\"\u003eAt the heart of the Marinemaster beats the newly developed \u003cstrong data-end=\"1834\" data-start=\"1812\"\u003eSeiko Calibre 8L45\u003c\/strong\u003e, one of the finest mechanical movements produced by Seiko outside of Grand Seiko.\u003c\/p\u003e\n\u003cp data-end=\"2130\" data-start=\"1918\"\u003eHand-assembled at the prestigious \u003cstrong data-end=\"1980\" data-start=\"1952\"\u003eShizukuishi Watch Studio\u003c\/strong\u003e in Japan, the movement has been specifically engineered for professional dive watches and delivers outstanding precision, durability and reliability.\u003c\/p\u003e\n\u003cp data-end=\"2154\" data-start=\"2132\"\u003eThe movement features:\u003c\/p\u003e\n\u003cul data-end=\"2330\" data-start=\"2156\"\u003e\n\u003cli data-end=\"2187\" data-start=\"2156\" data-section-id=\"aoaclx\"\u003eApprox. 72-hour power reserve\u003c\/li\u003e\n\u003cli data-end=\"2228\" data-start=\"2188\" data-section-id=\"g3ba49\"\u003eAccuracy of \u003cstrong data-end=\"2228\" data-start=\"2202\"\u003e+10\/-5 seconds per day\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"2259\" data-start=\"2229\" data-section-id=\"1mdxar4\"\u003eAutomatic and manual winding\u003c\/li\u003e\n\u003cli data-end=\"2283\" data-start=\"2260\" data-section-id=\"11yxkxo\"\u003eStop-seconds function\u003c\/li\u003e\n\u003cli data-end=\"2295\" data-start=\"2284\" data-section-id=\"13g95n0\"\u003e35 jewels\u003c\/li\u003e\n\u003cli data-end=\"2330\" data-start=\"2296\" data-section-id=\"1sb08d3\"\u003e28,800 vibrations per hour (4Hz)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"2532\" data-start=\"2332\"\u003eThe 8L45 represents the most accurate mechanical movement currently used in Seiko's Prospex collection, making it a fitting calibre for the Marinemaster flagship. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-end=\"2566\" data-start=\"2534\" data-section-id=\"2q672g\"\u003eBuilt for Professional Diving\u003c\/h2\u003e\n\u003cp data-end=\"2797\" data-start=\"2568\"\u003eEngineered to ISO diving standards, the HBF001J1 is every inch a professional tool watch. The stainless steel case features Seiko's \u003cstrong data-end=\"2722\" data-start=\"2700\"\u003eSuper-Hard Coating\u003c\/strong\u003e, improving scratch resistance while preserving the refined brushed finish.\u003c\/p\u003e\n\u003cp data-end=\"3275\" data-start=\"2799\"\u003eThe streamlined case houses a screw-down crown, screw case back and unidirectional ceramic bezel, delivering \u003cstrong data-end=\"2942\" data-start=\"2908\"\u003e300 metres of water resistance\u003c\/strong\u003e. A dual-curved sapphire crystal with anti-reflective coating provides outstanding clarity, while the newly developed sliding micro-adjustment clasp allows the bracelet to be adjusted by up to 16mm without tools, ensuring exceptional comfort whether worn over a wetsuit or directly on the wrist. \u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch2 data-end=\"3312\" data-start=\"3277\" data-section-id=\"1guo1dc\"\u003eA New Benchmark for Seiko Divers\u003c\/h2\u003e\n\u003cp data-end=\"3632\" data-start=\"3314\"\u003eThe Marinemaster HBF001J1 represents the next evolution of Seiko's professional dive watch lineage. Combining heritage-inspired design with one of the brand's finest mechanical movements, premium finishing and genuine professional capability, it is a watch equally suited to collectors, enthusiasts and serious divers.\u003c\/p\u003e\n\u003cp data-end=\"3828\" data-start=\"3634\"\u003eWith its timeless black dial, advanced engineering and unmistakable Marinemaster pedigree, the HBF001J1 stands as one of the most significant additions to the Prospex collection in recent years.\u003c\/p\u003e\n\u003ch2 data-end=\"3845\" data-start=\"3830\" data-section-id=\"1ma7m6t\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-end=\"4540\" data-start=\"3847\"\u003e\n\u003cli data-end=\"3868\" data-start=\"3847\" data-section-id=\"1whdqpr\"\u003eReference: HBF001J1\u003c\/li\u003e\n\u003cli data-end=\"3909\" data-start=\"3869\" data-section-id=\"30nc3w\"\u003eCollection: Seiko Prospex Marinemaster\u003c\/li\u003e\n\u003cli data-end=\"3949\" data-start=\"3910\" data-section-id=\"1intuy2\"\u003eSeiko Calibre 8L45 automatic movement\u003c\/li\u003e\n\u003cli data-end=\"3981\" data-start=\"3950\" data-section-id=\"114gce1\"\u003eAutomatic with manual winding\u003c\/li\u003e\n\u003cli data-end=\"4013\" data-start=\"3982\" data-section-id=\"aoaclx\"\u003eApprox. 72-hour power reserve\u003c\/li\u003e\n\u003cli data-end=\"4048\" data-start=\"4014\" data-section-id=\"pdxlnu\"\u003eAccuracy: +10\/-5 seconds per day\u003c\/li\u003e\n\u003cli data-end=\"4060\" data-start=\"4049\" data-section-id=\"13g95n0\"\u003e35 jewels\u003c\/li\u003e\n\u003cli data-end=\"4114\" data-start=\"4061\" data-section-id=\"sgfd\"\u003e42.6mm stainless steel case with Super-Hard Coating\u003c\/li\u003e\n\u003cli data-end=\"4154\" data-start=\"4115\" data-section-id=\"z1tbml\"\u003eSatin black professional diver's dial\u003c\/li\u003e\n\u003cli data-end=\"4200\" data-start=\"4155\" data-section-id=\"npzs33\"\u003eBlack ceramic unidirectional rotating bezel\u003c\/li\u003e\n\u003cli data-end=\"4215\" data-start=\"4201\" data-section-id=\"1fvpl6u\"\u003eDate display\u003c\/li\u003e\n\u003cli data-end=\"4246\" data-start=\"4216\" data-section-id=\"8ihjkc\"\u003eDual-curved sapphire crystal\u003c\/li\u003e\n\u003cli data-end=\"4289\" data-start=\"4247\" data-section-id=\"ukxftd\"\u003eAnti-reflective coating on inner surface\u003c\/li\u003e\n\u003cli data-end=\"4326\" data-start=\"4290\" data-section-id=\"6gbd4m\"\u003eLumiBrite hands, indexes and bezel\u003c\/li\u003e\n\u003cli data-end=\"4345\" data-start=\"4327\" data-section-id=\"6qv7r4\"\u003eScrew-down crown\u003c\/li\u003e\n\u003cli data-end=\"4408\" data-start=\"4346\" data-section-id=\"pywztw\"\u003eStainless steel bracelet with sliding micro-adjustment clasp\u003c\/li\u003e\n\u003cli data-end=\"4453\" data-start=\"4409\" data-section-id=\"16l4sgj\"\u003e300m professional diver's water resistance\u003c\/li\u003e\n\u003cli data-end=\"4486\" data-start=\"4454\" data-section-id=\"1s7fdrg\"\u003eMagnetic resistance: 4,800 A\/m\u003c\/li\u003e\n\u003cli data-end=\"4540\" data-start=\"4487\" data-section-id=\"rd6zor\"\u003eMade in Japan\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"SEIKO","offers":[{"title":"Default Title","offer_id":57249249296759,"sku":"HBF001J1","price":3300.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0402\/0643\/4455\/files\/HBF001J1_ima_4_2026.png?v=1783347289","url":"https:\/\/www.deacons-jewellers.com\/products\/seiko-prospex-marinemaster-1968-heritage","provider":"Deacon \u0026 Son  ","version":"1.0","type":"link"}