Seiko Prospex Marinemaster 1968 Heritage Diver’s Mechanical Automatic JAMSTEC Limited Edition HBF002

Seiko Prospex Marinemaster 1968 Heritage Diver’s 300M Mechanical Automatic JAMSTEC Limited Edition HBF002J Limited Edition of 1,000 pieces Arctic Blue — Spirit of Fearless Exploration In the 1980s, Seiko proved its dive watches in the unforgiving depths. By 1983, prototypes rated to 600 meters survived JAMSTEC’s SHINKAI 20000 submersible — proof that Seiko engineering belonged in the deep. The dial defines this Marinemaster. Its carved texture mirrors the path of an icebreaker across frozen seas, while a gradient of deepening blue draws the eye inward. A polished transparent layer heightens clarity and depth, creating a surface that feels alive — a vision of the Arctic suspended beneath sapphire. A blue ceramic bezel frames the dial with lasting contrast and scratch resistance, while a newly designed clasp ensures comfort without compromise. This is a collector’s chronograph of exploration — a watch that embodies Seiko’s enduring partnership with JAMSTEC and its drive to push boundaries in both science and watchmaking. HBF002J Specification: Movement Caliber: 8L45 Movement Type: Automatic with manual winding Precision: +10 to -5 seconds per day Power reserve: Approx. 72 hours(3 days) Jewels: 35 Function: 28,800 vibrations per hour (8 beats per second) Stop-second hand function Date display Exterior Case Material: Stainless steel (Bezel: Stainless steel with ceramic display) Case Size: Thickness:14.1mm; Diameter:42.6mm; Lug-to-lug:49.3mm Crystal: Dual-curved sapphire crystal Crystal Coating: Anti-reflective coating on inner surface LumiBrite: LumiBrite on hands, index(es) and bezel Clasp: Three-fold clasp＆push button release, solid & slide adjuster Distance between lugs: 20 Other Details Water Resistance: 300m / 1000ft diver's Magnetic Resistance: 4,800 A/m LIMITED EDITION on the case back Serial number engraved on the case back Unidirectional rotating bezel Screw-down crown Screw case back * Kindly note that the displayed image is either a graphic representation or a prototype and may not precisely reflect the final product. Color variations may occur due to differences in browsers, display settings, or devices used for viewing. Additionally, the orientation of the case back in the actual product may differ from what is shown in the photograph.