{"product_id":"seiko-selection-open-heart-hfb001j-mens-watch","title":"Seiko Selection Open Heart HFB001J Men's Watch","description":"\u003cp data-path-to-node=\"6\" id=\"p-rc_58efae4adfad6e27-301\"\u003e\u003cspan class=\"citation-1076\"\u003eThe \u003c\/span\u003e\u003cspan class=\"citation-1076\"\u003eSeiko Selection HFB001J\u003c\/span\u003e\u003cspan class=\"citation-1076\"\u003e (released within the acclaimed Japanese domestic \u003c\/span\u003e\u003cspan class=\"citation-1076\"\u003eSeiko Selection S Series Mechanical Collection\u003c\/span\u003e\u003cspan class=\"citation-1076 citation-end-1076\"\u003e) is a refined, high-performance Japanese automatic mechanical open-heart dress-sports timepiece.\u003csup class=\"superscript\" data-turn-source-index=\"1\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Embodying the core design philosophy of the Seiko Selection line—uncompromising dedication to functional beauty, everyday versatility, and accessible Japanese manufacturing excellence—this modern reference introduces a renewed semi-skeleton dial architecture tailored for contemporary lifestyles. \u003cspan class=\"citation-1075\"\u003eAcross horology collector forums, everyday carry communities, and Japanese watch circles, it has earned defining community nicknames—the \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"White Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"S Series Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"Semi-Skeleton\"\u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e, \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"Mechanical S Series\"\u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e, or \u003c\/span\u003e\u003cspan class=\"citation-1075\"\u003e\"Pure White Open Heart\"\u003c\/span\u003e\u003cspan class=\"citation-1075 citation-end-1075\"\u003e—for its sunburst white dial, open balance-wheel aperture, faceted dimensional indices, and versatile 40.0mm case architecture.\u003csup class=\"superscript\" data-turn-source-index=\"2\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1074 citation-end-1074\"\u003eIt unites a sculpted 316L solid stainless steel case in a balanced 40.0mm diameter with a radiant radial white dial face, three-sided diamond-cut hour batons, an open-heart mechanical aperture revealing the escapement, an in-house Japanese automatic mechanical caliber, durable Hardlex crystal glass, certified 100-meter water resistance, and an integrated solid stainless steel construction with an easy-adjust mechanism.\u003csup class=\"superscript\" data-turn-source-index=\"3\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1073 citation-end-1073\"\u003ePerfectly calibrated for gentlemen seeking a versatile, high-grade mechanical daily wearer that transitions effortlessly from corporate boardroom meetings and formal gatherings to relaxed weekend leisure.\u003csup class=\"superscript\" data-turn-source-index=\"4\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003cspan class=\"citation-1072 citation-end-1072\"\u003eThe defining visual centerpiece of this HFB001J reference is its multi-layered, sunburst white dial face.\u003csup class=\"superscript\" data-turn-source-index=\"5\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Finished with an ultra-fine radial brushing technique, the white surface diffuses ambient lighting into subtle, iridescent reflections that enhance visual depth. \u003cspan class=\"citation-1071 citation-end-1071\"\u003ePositioned prominently at 9 o'clock is a signature open-heart circular aperture bordered by a polished silver-tone chapter frame, providing an unobstructed view into the oscillating balance wheel and escapement mechanism to showcase the living mechanical heartbeat of the caliber.\u003csup class=\"superscript\" data-turn-source-index=\"6\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1070 citation-end-1070\"\u003eCircling the perimeter are three-dimensional, three-sided faceted applied baton hour markers with wide, rainbow-ground chamfered angles that capture light dynamically from every angle.\u003csup class=\"superscript\" data-turn-source-index=\"7\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Faceted sword-style hour and minute hands glide smoothly across the face alongside a slender central sweep seconds hand, delivering instantaneous legibility. \u003cspan class=\"citation-1069 citation-end-1069\"\u003eThe outer track features fine minute demarcations that provide clean, uncluttered time tracking.\u003csup class=\"superscript\" data-turn-source-index=\"8\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Framing the dial is a fixed, mirror-polished solid stainless steel bezel that flows naturally into the case contours.  \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003eBeneath its tailored exterior, the watch is driven by Seiko’s proven in-house Calibre 4R38 Japanese automatic mechanical movement, engineered and manufactured at Seiko’s dedicated horological facilities in Japan. \u003cspan class=\"citation-1068\"\u003eOperating at a steady frequency of 21,600 vibrations per hour (3 Hz), this 24-jewel self-winding caliber harnesses the kinetic energy of the wearer’s wrist to wind the mainspring, delivering approximately \u003c\/span\u003e\u003cspan class=\"citation-1068\"\u003e41 hours of autonomous power reserve\u003c\/span\u003e\u003cspan class=\"citation-1068 citation-end-1068\"\u003e on a full wind.\u003csup class=\"superscript\" data-turn-source-index=\"9\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1067 citation-end-1067\"\u003eDesigned purposefully without a calendar mechanism to maintain pristine open-heart dial symmetry, the caliber features both automatic self-winding and manual hand-winding capabilities, along with a hacking seconds (stop-seconds) mechanism that halts the seconds hand when the crown is pulled out for down-to-the-second time synchronization.\u003csup class=\"superscript\" data-turn-source-index=\"10\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1066\"\u003eBuilt with Seiko’s proprietary \u003c\/span\u003e\u003cspan class=\"citation-1066\"\u003eDiashock\u003c\/span\u003e\u003cspan class=\"citation-1066\"\u003e shock-absorbing system, the movement delivers dependable reliability rated to a factory precision tolerance of \u003c\/span\u003e\u003cspan class=\"citation-1066\"\u003e+45 to -35 seconds per day\u003c\/span\u003e\u003cspan class=\"citation-1066\"\u003e and incorporates \u003c\/span\u003e\u003cspan class=\"citation-1066\"\u003eJIS Class 1 magnetic resistance (4,800 A\/m)\u003c\/span\u003e\u003cspan class=\"citation-1066 citation-end-1066\"\u003e, protecting timekeeping accuracy against daily electromagnetic exposure from smartphones and laptops.\u003csup class=\"superscript\" data-turn-source-index=\"11\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003c!----\u003e\u003cspan class=\"citation-1065\"\u003eThe case is engineered with versatile, modern dress-sports proportions, measuring an official \u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e40.0mm in case diameter\u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e with a case profile thickness of \u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e11.8mm\u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e, a compact \u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e46.2mm lug-to-lug distance\u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e, and a standard \u003c\/span\u003e\u003cspan class=\"citation-1065\"\u003e20mm lug width\u003c\/span\u003e\u003cspan class=\"citation-1065 citation-end-1065\"\u003e, delivering an ergonomic, flush drape on wrists of all sizes.\u003csup class=\"superscript\" data-turn-source-index=\"12\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1064 citation-end-1064\"\u003eThe solid 316L stainless steel case architecture combines vertical hairline satin brushing across the upper lugs with mirror-polished case flanks and bevels to create a sharp, multi-dimensional presence.\u003csup class=\"superscript\" data-turn-source-index=\"13\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e Dial protection is provided by a high-grade flat Hardlex crystal engineered to withstand everyday impacts and surface abrasions. \u003cspan class=\"citation-1063\"\u003eBuilt for dependable everyday resilience, the watch features an ergonomic fluted pull-out crown at 3 o'clock and an exhibition see-through screw-down caseback that allows the wearer to view the mechanical balance and oscillating rotor, while securing an impressive \u003c\/span\u003e\u003cspan class=\"citation-1063\"\u003e10-bar (100 meters \/ 330 ft) water resistance rating\u003c\/span\u003e\u003cspan class=\"citation-1063 citation-end-1063\"\u003e, making it fully resilient against heavy rain, accidental splashes, and swimming.\u003csup class=\"superscript\" data-turn-source-index=\"14\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e \u003cspan class=\"citation-1062 citation-end-1062\"\u003eThe timepiece comes completed on an integrated solid stainless steel multi-link construction featuring satin-brushed outer rows and polished center link accents, secured by a sturdy one-push three-fold deployment clasp with an easy-adjustment sizing system.\u003csup class=\"superscript\" data-turn-source-index=\"15\"\u003e\u003c!----\u003e\u003c\/sup\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"MonaWatch","offers":[{"title":"Default Title","offer_id":67699346440506,"sku":"HFB001J","price":1160.0,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0920\/5858\/3354\/files\/NewProject_61d99074-1e02-4b4f-a227-e938cea3fe0c.webp?v=1791994060","url":"https:\/\/www.monawatch.com\/products\/seiko-selection-open-heart-hfb001j-mens-watch","provider":"MonaWatch","version":"1.0","type":"link"}