Seiko Prospex Automatic Heritage Diver's GMT 1968 green dial steel bracelet 42 mm

1968 heritage reimagined for a modern GMT diver

The Seiko Prospex HBC001J1 continues the legacy of Seiko's professional dive watches. Inspired by the iconic 1968 diver, it features the design elements that made this family famous: a robust case, exceptional legibility, a screw-down crown positioned at 4 o’clock and a construction built for action.

More than a simple vintage-inspired reinterpretation, the HBC001J1 updates the spirit of the 1968 diver with enhanced specifications, a practical GMT function and water resistance increased to 300 metres. A watch equally suited to underwater exploration, travel and everyday life.

A green dial inspired by Japan’s coastal landscapes

The Seiko Prospex HBC001J1 immediately stands out thanks to its deep green dial, inspired by the colours of Japan’s coastal waters. This distinctive shade gives the watch a strong identity while remaining faithful to the functional nature of the Prospex collection.

Generously LumiBrite-filled applied indexes, broad hands and excellent readability remind us that this watch is first and foremost a professional diving instrument. The green ceramic unidirectional bezel completes the design while offering outstanding scratch resistance.

A contrasting GMT hand allows easy tracking of a second time zone, making this reference an ideal companion for both travel and maritime adventures.

A true professional diver rated to 300 metres

The 42 mm stainless steel case retains the balanced proportions that have made Seiko's 1968-inspired Prospex divers so successful. With a thickness of 13.3 mm and a lug-to-lug length of 48.6 mm, the watch remains comfortable despite its professional capabilities.

The screw-down crown positioned at 4 o’clock, a historic Seiko diving signature, improves comfort while reducing the risk of impacts. An anti-reflective sapphire crystal, screw-down case back and unidirectional diving bezel complete the robust construction.

Its 300-metre water resistance confirms its status as a modern professional dive watch, ready to perform in the most demanding environments.

The in-house 6R54 calibre with GMT functionality

At the heart of the HBC001J1 beats Seiko’s in-house automatic calibre 6R54. This modern movement features a GMT complication, allowing a second time zone to be displayed through a dedicated 24-hour hand.

Operating at 21,600 vibrations per hour, it delivers an impressive 72-hour power reserve. The movement also features manual winding capability and a stop-seconds function for precise time-setting.

This combination of reliability, autonomy and practicality makes the 6R54 one of the most versatile movements in the current Prospex collection.

A steel bracelet designed for real-world comfort

The Seiko Prospex HBC001J1 is fitted with a robust stainless steel bracelet designed to accompany every adventure.

Its latest-generation folding clasp incorporates a tool-free micro-adjustment system that allows quick bracelet resizing. Spread across six positions of approximately 2.5 mm each, it provides up to 15 mm of adjustment to ensure optimal comfort throughout the day.

With the HBC001J1, Seiko delivers a highly accomplished GMT dive watch that successfully combines historical heritage, professional performance and modern comfort.