SEIKO HBF002J1 Men’s Analog Watch PROSPEX Marinemaster 1968 Heritage JAMSTEC Limited Edition 1,000 pcs Date Display Textured Dial Automatic 42.6mm SS Bracelet Blue Gradient Dial

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Marinemaster 1968 Heritage JAMSTEC Limited Edition of 1,000 pieces

The Prospex Marinemaster upholds Seiko’s longstanding legacy of bold exploration in a collaboration with JAMSTEC.
Seiko’s journey in diver’s watchmaking began in 1965 with Japan’s first diver’s watch, which accompanied members of the Japanese Antarctic Research Expedition to the South Pole from 1966 to 1969. This model was followed by the creation of the nation’s first 300m water-resistant diver’s watch in 1968. In the decades since, Seiko has developed new technologies, designs, and features that have made its diver’s watches a trusted favorite among professionals and enthusiasts worldwide.

The company’s legacy of testing the limits of the modern sports watch and supporting marine conservation continues through its partnership with the Japan Agency for Marine-Earth Science and Technology (JAMSTEC), which began in the 1980s. In 1983, two professional diver’s watches rated to 600 meters were successfully tested aboard SHINKAI 2000, a manned research submersible operated by JAMSTEC.

For decades, JAMSTEC has been engaged in marine research to advance science and technology and promote academic progress through various initiatives. One such effort is the Arctic Research Program. As part of this, Japan’s first research vessel with icebreaking capabilities, Mirai II (the word mirai means “future” in Japanese), will be completed this year, enabling data collection in ice-covered seas.

Inspired by the spirit of bold exploration that connects JAMSTEC and Seiko, two new diver’s watches join Prospex’s flagship Marinemaster series. The first is a JAMSTEC collaboration, and the second is a continuous production model. Both are powered by Seiko’s self-winding Caliber 8L45 mechanical movement and represent the pinnacle of the Seiko 300m water-resistant diver’s watch.

Honoring a spirit of exploration and forging new paths
The collaboration model showcases a new textured dial that imagines the trail forged by an icebreaker as it advances through sea ice, symbolizing how Arctic research paves the way for the future. Its vertically oriented blue gradient, which deepens at the center, is finished with a thick, clear coating and then polished, echoing the boundless, crystalline depth of the Arctic Ocean. The blue ceramic bezel enhances the beauty of the dial while providing exceptional scratch resistance.
The back of the watch is marked “JAMSTEC LIMITED EDITION” and includes the individual number out of 1,000.

About JAMSTEC
The Japan Agency for Marine-Earth Science and Technology (JAMSTEC) is a national institute for comprehensive marine research and development dedicated to advancing innovative science and technology. JAMSTEC fosters academic progress, and deepens understanding of the Earth and life, while contributing to the sustainable development of society and the preservation of the global environment. Using data obtained through its research, JAMSTEC strives to address societal and economic needs and drive innovation across multiple sectors.

Specifications
Movement
Caliber Number
8L45

Movement Type
Automatic with manual winding

Precision
+10 to -5 seconds per day

Power reserve
Approx. 72 hours(3 days)

Jewels
35

Functions
28,800 vibrations per hour (8 beats per second)
Stop second hand function
Date display

Case/Band
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
20mm

Other Details
Water Resistance
300m / 1000ft diver’s

Magnetic Resistance
4,800 A/m

Features
LIMITED EDITION on the case back
Serial number engraved on the case back
Unidirectional rotating bezel
Screw-down crown
Screw case back