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
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