The Seiko Prospex 1968 Heritage Diver’s GMT series represents a pinnacle of Seiko’s tool-watch evolution, blending the rugged DNA of their historic divers with the practical utility of a dual-time complication. This series consists of two models, HBC001 with green dial and HBC002 model with black dial.
The primary inspiration for these timepieces is the landmark 1968 Seiko Diver, which was Japan’s first high-beat diver’s watch with a one-piece case and 300m water resistance. While the original was a pure diving instrument, these modern versions integrate a GMT function. However, the "Professional Specifications" (Prospex) philosophy remains at the core, ensuring these watches transition seamlessly from the deep sea to international travel.
The case design is a faithful but modernized tribute to the 1968 original. It features a robust profile with mirror-finished sides that provide a sharp, luxury feel despite its "tool" identity. The bezel is fitted with a scratch-resistant ceramic insert, featuring a luminous 60-minute scale for elapsed time tracking. This timepiece features a well-proportioned 42.0mm case diameter with a thickness of 13.3mm, offering a substantial yet wearable presence on the wrist.
The watch is constructed from stainless steel treated with a "Super-Hard Coating" to ensure long-term durability and scratch resistance. Protecting the dial is a sapphire crystal featuring an anti-reflective coating on the inner surface, which guarantees exceptional legibility in various lighting conditions. Built for serious aquatic exploration, it boasts a water resistance of 300 meters, meeting professional Diver’s standards.
The HBC001 model is inspired by the lush landscapes and deep greens of the Pacific. It features a rich, deep green dial with a subtle texture that captures the movement of light beneath the water. While the HBC002 is a classic and authoritative choice and utilizes a deep "Oceanic Black" dial. This satin-finished black dial offers maximum contrast, emphasizing the watch's professional heritage.
Both models feature a sloped internal flange that houses the 24-hour GMT scale, adding a sense of depth and architectural complexity to the face of the watch. For low-light visibility, Seiko’s proprietary LumiBrite is applied generously across the hands, indexes, and the bezel's zero-marker.
At the heart of these models is the Caliber 6R54, an in-house automatic GMT movement. It is notable for its impressive 72-hour power reserve, allowing the watch to remain accurate even if left unworn over a weekend. The GMT hand is independently adjustable, allowing for effortless tracking of a second time zone without disturbing the main timekeeping hands.
The Seiko Prospex 1968 Heritage Diver’s GMT HBC001 and HBC002 are more than just re-issues; they are sophisticated evolutions of a diving icon. By pairing 300m water resistance with a 3-day GMT movement and high-end finishes, Seiko has created a versatile "desk-to-deep" companion. Whether you choose the vibrant Pacific Green or the classic Oceanic Black, these watches serve as a testament to Seiko's 60-year legacy of innovation in maritime timekeeping. These watches will be available in May, 2026, and priced at £1,600.
Design and Specification
The bracelet itself is a three-link stainless steel design with a slim profile and a low center of gravity, which ensures that despite the watch’s substantial presence, it remains balanced and comfortable on the wrist throughout the day. A significant upgrade in these models is the micro-adjustment clasp. Designed for both comfort and utility, the clasp can be adjusted in six steps over a total range of 15mm. This allows for quick, tool-free resizing to accommodate wrist swelling in hot weather or to fit over a thin wetsuit.
Models and Movement
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