The Seiko Selection HFB001J (released within the acclaimed Japanese domestic Seiko Selection S Series Mechanical Collection) is a refined, high-performance Japanese automatic mechanical open-heart dress-sports timepiece. 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. Across horology collector forums, everyday carry communities, and Japanese watch circles, it has earned defining community nicknames—the "Open Heart", "White Open Heart", "S Series Open Heart", "Semi-Skeleton", "Mechanical S Series", or "Pure White Open Heart"—for its sunburst white dial, open balance-wheel aperture, faceted dimensional indices, and versatile 40.0mm case architecture. It 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. Perfectly 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. The defining visual centerpiece of this HFB001J reference is its multi-layered, sunburst white dial face. Finished with an ultra-fine radial brushing technique, the white surface diffuses ambient lighting into subtle, iridescent reflections that enhance visual depth. Positioned 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. Circling 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. Faceted sword-style hour and minute hands glide smoothly across the face alongside a slender central sweep seconds hand, delivering instantaneous legibility. The outer track features fine minute demarcations that provide clean, uncluttered time tracking. Framing the dial is a fixed, mirror-polished solid stainless steel bezel that flows naturally into the case contours.  Beneath 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. Operating 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 41 hours of autonomous power reserve on a full wind. Designed 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. Built with Seiko’s proprietary Diashock shock-absorbing system, the movement delivers dependable reliability rated to a factory precision tolerance of +45 to -35 seconds per day and incorporates JIS Class 1 magnetic resistance (4,800 A/m), protecting timekeeping accuracy against daily electromagnetic exposure from smartphones and laptops. The case is engineered with versatile, modern dress-sports proportions, measuring an official 40.0mm in case diameter with a case profile thickness of 11.8mm, a compact 46.2mm lug-to-lug distance, and a standard 20mm lug width, delivering an ergonomic, flush drape on wrists of all sizes. The 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. Dial protection is provided by a high-grade flat Hardlex crystal engineered to withstand everyday impacts and surface abrasions. Built 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 10-bar (100 meters / 330 ft) water resistance rating, making it fully resilient against heavy rain, accidental splashes, and swimming. The 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.

• All Watches Ship from the UAE
• Express Shipping Available across the UAE and worldwide via trusted couriers like FedEx, DHL, or Aramex (selected at our discretion)
• UAE Orders: Delivered within 1 business day
• International Orders: Typically delivered within 2–5 business days after being processed
• Customs / Duties: Customers are responsible for any import duties or taxes charged by their local customs authority. These fees are based on the declared value and must be paid at delivery.
• 14-Day Return & Refund Policy from the date of delivery – see our Refund Policy for full details