HBC001J1

HBC001J1

The Seiko Prospex 1968 Heritage Diver’s 300M GMT — HBC001J1 is a huge step forward for the Prospex line as it adds a mechanical GMT complication to Seiko’s iconic saturation diver design from 1968. This high-quality timepiece is set to release in May 2026; it features a brand-new 4 o’clock crown and ceramic bezel and a 300m water resistance, with original 1968 design elements like the mirror finish case sides as well. The “Pacific Green” colorway is one of its highlights, featuring a deep green dial, a matching glossy, ceramic bezel and a rich, gold-tone GMT hand.

Key Features & Design Highlights

• First Mechanical GMT Diver Platform: Driven by the newly developed in-house Caliber 6R54, this model permits seamless dual-time tracking. The gold GMT hand can be read against a subtle 24-hour scale printed on the dial ring, keeping your home time or UTC distinct from local time.

• Upgraded 300M Depth Rating: While previous iterations in the modern heritage family featured 200m depth ratings, the HBC001J1 steps up to a professional-grade 300m (1,000 ft) water resistance.

• Scratch-Resistant Ceramic Bezel: Framed by a glossy, deep green Japanese ceramic unidirectional insert, the bezel features a clean elapsed-time diving scale with an easy-to-grip knurled edge.

• Tool-Free Slide-Adjuster Clasp: Addressing a frequent request from collectors, Seiko equipped this model with an updated premium clasp featuring a built-in slide adjuster. It can be micro-adjusted on the fly across 6 distinct steps (totaling roughly 15mm) to perfectly accommodate shifts in wrist size due to heat, cold, or wetsuit compression.

• Super-Hard Coating: The stainless steel case and three-link bracelet are protected by Seiko’s proprietary super-hard coating, significantly boosting scratch resistance during rugged daily wear.

Technical Specifications