{"product_id":"seiko-prospex-marinemaster-hbf001-1968-heritage-diver-s-watch","title":"Seiko Prospex Marinemaster HBF001 1968 Heritage Diver’s Watch","description":"\u003cp dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong\u003eSeiko Prospex Marinemaster HBF001\u003c\/strong\u003e brings one of the most important designs in Seiko diving history into the modern Marinemaster collection. Inspired by Seiko’s groundbreaking \u003cstrong\u003e1968 300-meter diver\u003c\/strong\u003e, the HBF001 retains the flowing case silhouette and signature 4 o’clock crown while introducing Seiko’s high-performance \u003cstrong\u003eCaliber 8L45 automatic movement\u003c\/strong\u003e. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eA finely textured \u003cstrong\u003edeep black dial\u003c\/strong\u003e is designed to minimize reflected light, while beveled indexes, LumiBrite and a glossy ceramic bezel deliver strong visibility. At \u003cstrong\u003e42.6mm\u003c\/strong\u003e, this is unmistakably a serious dive watch, but the refined case finishing and heritage-driven proportions give it a level of sophistication that separates the Marinemaster from the rest of the Prospex lineup. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eSeiko Prospex Marinemaster\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eInspired by Seiko’s historic \u003cstrong\u003e1968 diver\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaliber 8L45\u003c\/strong\u003e automatic movement with manual winding\u003c\/li\u003e\n\u003cli\u003eApproximately \u003cstrong\u003e72-hour power reserve\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAccuracy rated \u003cstrong\u003e+10\/-5 seconds per day\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e42.6mm stainless steel case\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eDeep black, fine-textured dial\u003c\/li\u003e\n\u003cli\u003eScratch-resistant \u003cstrong\u003eceramic bezel insert\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDual-curved sapphire crystal with inner anti-reflective coating\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e300-meter \/ 1,000-foot diver’s water resistance\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eNewly developed adjustable bracelet clasp\u003c\/li\u003e\n\u003cli\u003eReference \u003cstrong\u003eHBF001J1\u003c\/strong\u003e \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"auto\"\u003eThe Skeie’s Perspective\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThis is an important watch for anyone who understands where Seiko sits in the history of the modern dive watch. The HBF001 isn’t simply another Prospex diver—it sits within \u003cstrong\u003eMarinemaster, Seiko’s flagship diver series\u003c\/strong\u003e, and its design traces directly back to the landmark 1968 professional diver. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eWhat makes this one especially compelling to us is the combination of purpose and finishing. You still get the unmistakable tool-watch elements—300-meter water resistance, a ceramic timing bezel, serious LumiBrite and a screw-down crown—but the dial texture, case finishing and upgraded movement make it feel substantially more elevated on the wrist.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eThe 1968 Heritage\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eIn 1968, Seiko introduced Japan’s first \u003cstrong\u003e300-meter water-resistant diver’s watch\u003c\/strong\u003e, following the company’s first diver introduced in 1965. The HBF001 draws directly from that historic model, preserving its distinctive flowing silhouette and crown positioned at 4 o’clock. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThe black dial has a fine-grain surface engineered to reduce reflected light, while the beveled index edges are designed to catch available light from different angles. The result is a dial that references the past without feeling like a simple reproduction. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eCaliber 8L45 — Built for Marinemaster\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eInside is Seiko’s \u003cstrong\u003eCaliber 8L45\u003c\/strong\u003e, a 35-jewel mechanical movement operating at \u003cstrong\u003e28,800 vibrations per hour\u003c\/strong\u003e. Seiko revised the mainspring and accuracy adjustment for this caliber, resulting in approximately \u003cstrong\u003e72 hours of power reserve\u003c\/strong\u003e and a stated accuracy of \u003cstrong\u003e-5 to +10 seconds per day\u003c\/strong\u003e—which Seiko describes as the highest accuracy among its current mechanical movements. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003eA Better Bracelet for a Serious Diver\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eSeiko also developed a new clasp for this generation of Marinemaster. Its slide-adjustment system provides up to \u003cstrong\u003e16mm of adjustment in 2mm increments\u003c\/strong\u003e, allowing the bracelet to be fine-tuned without sacrificing the clean appearance of the clasp\u003c\/p\u003e","brand":"Seiko","offers":[{"title":"Default Title","offer_id":52991439274295,"sku":"HBF001","price":3600.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0081\/4923\/7841\/files\/HBF001J1_ima_4_2026.png?v=1789509164","url":"https:\/\/skeies.com\/products\/seiko-prospex-marinemaster-hbf001-1968-heritage-diver-s-watch","provider":"Skeie's Jewelers","version":"1.0","type":"link"}