SEIKO WATCH AUTOMATIC PROSPEX 62MAS SEA 145TH ANNIVERSARY LIMITED EDITION JDM 40.5MM HBC005J1

The Seiko Prospex HBC005J1 is the premium model in Seiko's second wave of 145th Anniversary Prospex limited editions — the 1965 Heritage Diver in Seiko Blue, limited to 4,000 pieces worldwide. Built on the 1965 Heritage platform that traces its design DNA directly to the 62MAS — Japan's first diver's watch, produced in 1965 — the HBC005J1 takes the iconic compact 40mm case and applies the 145th Anniversary Seiko Blue treatment: a blue aluminium unidirectional rotating bezel, a blue seconds hand, and a silver-white dial that creates the clean, cool, formally modern aesthetic that defines the entire 145th Anniversary series. At 4,000 pieces, it is more exclusive than the 9,999-piece HBB001K1, and more accessible than the 2,500-piece HAB004J1 Astron. The specification is where the HBC005J1 separates itself decisively from the HBB001K1 sibling. The 6R55 calibre delivers +25/-15 seconds per day accuracy and a 72-hour power reserve — a full three-day reserve versus the HBB001K1's 41 hours. The curved sapphire crystal with anti-reflective coating on the inner surface replaces the Hardlex of the larger sibling with premium optical clarity and scratch resistance. And the water resistance rating is Diver's 300M — 50% deeper than the HBB001K1's 200M, and one of the highest ratings available in any 40mm steel dive watch in this price range. The three-fold clasp with secure lock, push-button release, and solid and slide adjuster completes a full professional diver's specification in the 1965 Heritage's compact and historically grounded case. DESCRIPTION: Movement Caliber Number: 6R55 Movement Type: Automatic with manual winding Precision: +25 to -15 seconds per day Power reserve: Approx. 72 hours(3 days) Jewels: 24 Functions Stop second hand function Case/Band Case Material: Stainless steel Case Size Thickness:13.0mm Diameter:40.0mm Lug-to-lug:46.4mm Crystal: Curved sapphire crystal Crystal Coating: Anti-reflective coating on inner surface LumiBrite on hands, index(es) and bezel Three-fold clasp with secure lock & push button release, solid & slide adjuster Distance between lugs: 20mm Features LIMITED EDITION on the case back Unidirectional rotating bezel Screw-down crown Screw case back Other Details Water Resistance: 300m / 1000ft diver's Magnetic Resistance: 4,800 A/m