Seiko Prospex 1968 Heritage Diver’s GMT Black Dial- Ref. HBC002

Next-Generation Mechanical GMT Diver

Take your underwater explorations and global travels further with the Seiko Prospex HBC002 (HBC002J1). This premium timepiece serves as a modern re-interpretation of Seiko’s iconic 1968 dive watch, bringing a major evolutionary leap to the Prospex Sea collection. As one of the first models to feature a mechanical GMT complication built directly into a true professional diver, it allows you to effortlessly track a second time zone via a striking gold-tone 24-hour hand without ever interrupting the main timekeeping hands.

The "Oceanic Black" dial features a clean finish, balanced by high-contrast, oversized hour plots and faceted hands heavily coated in bright LumiBrite for legibility in pitch-black aquatic conditions. Framing the dial is a lustrous, scratch-resistant black ceramic unidirectional rotating elapsed-time bezel with a knurled edge designed for easy operability, even while wearing thick diving gloves. A red-tipped lollipop seconds hand sweeps smoothly across the dial face, adding a sporty pop of vintage accuracy.

Enhanced 300M Depth Rating and New Micro-Adjust Clasp

Built to survive extreme environments, the HBC002 features an upgraded water resistance of 300 meters (1,000 feet), providing serious professional-grade scuba utility. It is powered by the high-tier, in-house caliber 6R54 automatic GMT movement, operating at 21,600 vibrations per hour and delivering a commanding 3-day (72-hour) power reserve—the longest of any mechanical watch in its class. For symmetry and visual balance, a discreet date window is tucked seamlessly between the 4 and 5 o'clock positions.

The watch is built with a 42.0mm stainless steel case treated with a super-hard coating, paired with mirror-finished case sides that reflect its heritage roots. The face is shielded by a flat, scratch-resistant sapphire crystal with an anti-reflective coating on the inner surface. Perfecting the wearability, it comes attached to a sporty three-link stainless steel bracelet equipped with Seiko’s newly redesigned tool-free slide-adjuster clasp. This innovative closure can be easily fine-tuned in six incremental steps of 2.5mm (for a total range of 15mm), letting you perfectly adjust for wrist changes on the go or fit it seamlessly over a wet suit.

• Brand: Seiko

• Collection: Prospex Sea (1968 Heritage Re-interpretation)

• Model Number: HBC002 (HBC002J1)

• Movement: Caliber 6R54 Mechanical Automatic GMT (Hacking & Hand-Winding Capable)

• Power Reserve: Approx. 72 Hours / 3 Full Days (24 Jewels)

• Case Material: Stainless Steel with Super-Hard Coating & Mirror-Polished Sides

• Bezel: Black Ceramic Unidirectional Rotating Elapsed Timing Display

• Dial Details: Oceanic Black Dial with Gold-Tone GMT Hand & 4:30 Date Window

• Luminescence: LumiBrite on Hands, Hour Markers, and Bezel Pip

• Crystal: Sapphire Crystal with Inner Anti-Reflective Coating

• Case Dimensions: 42.0mm Diameter / 13.3mm Thickness / 48.6mm Lug-to-Lug

• Bracelet: Super-Hard Coated Stainless Steel 3-Link Band with 15mm Slide Adjuster Clasp

• Water Resistance: 300 Meters (1,000 Feet) Diver's Watch