HBF002J [Limited 1000]

Main Features

HBF002J is the Seiko Prospex Marinemaster 1968 Heritage Diver’s Watch JAMSTEC Limited Edition. Its key features include a dial inspired by the route carved by an icebreaker during polar exploration, a balance of beauty and functionality, and a newly developed clasp designed for comfortable wear.

Movement

Caliber: 8L45
Driving system: Mechanical, automatic with manual winding
Accuracy under normal usage: +10 to -5 seconds per day
Power reserve: Approximately 72 hours when fully wound
Jewels: 35
Functions: Stop-seconds function, 28,800 vibrations per hour, date calendar

This model is powered by Caliber 8L45, described as offering Seiko’s most stable accuracy among its current mechanical movements and approximately 72 hours of power reserve.

Exterior and Size

Case: Stainless steel with ceramic bezel insert
Case coating: DiaShield
Crystal: Dual-curved sapphire crystal
Crystal coating: Anti-reflective coating on inner surface
Lumibrite: Hands, indexes, and bezel
Case size: 14.1mm thickness, 42.6mm diameter, 49.3mm lug-to-lug

The glossy blue ceramic bezel insert enhances the beauty of the dial while also providing high scratch resistance.

Water Resistance and Functions

Water resistance: Diver’s water resistance
Magnetic resistance: Yes
Other features: Unidirectional rotating bezel, screw case back, screw-down crown, “LIMITED EDITION” marking on the case back, and serial number on the case back.

JAMSTEC Collaboration

This limited edition is a collaboration with JAMSTEC, the Japan Agency for Marine-Earth Science and Technology. Seiko has worked with JAMSTEC since the 1980s, including a 1983 verification experiment for a saturation diving watch using the manned research submersible Shinkai 2000. From 2025, Seiko also began supporting JAMSTEC’s Arctic research.

Arctic Exploration Dial

The dial is inspired by the image of an icebreaker opening a route through sea ice during polar exploration. Its three-dimensional stamped pattern evokes tracks carved into sea ice, while the blue gradient deepening toward the center and thick transparent coating create depth and clarity reminiscent of the Arctic Ocean.

Beauty and Functionality

The 1968 Heritage exterior design uses a glossy blue ceramic bezel insert. This enhances the dial’s visual beauty while adding high scratch resistance, making the watch both attractive and practical.

Newly Developed Comfortable Clasp

The clasp uses a newly developed one-push diver adjuster system. It offers approximately 16mm of adjustment in eight steps of about 2mm each. The extension can be retracted even while the clasp remains closed, helping maintain comfort both while diving and in daily wear.

Recommended For

This model is easy to recommend for Seiko Prospex collectors, Marinemaster fans, customers looking for a professional Japanese diver’s watch, fans of ocean and Arctic exploration stories, and international customers who appreciate limited-edition watches connected to Japanese scientific research.