Seiko Prospex 1968 Heritage Diver’s GMT U.S. Limited Edition Watch SPB475

The Seiko Prospex 1968 Heritage Diver’s GMT U.S. Limited Edition 42mm (Ref. SPB475) honours Seiko’s landmark 1968 Diver’s Watch through distinctive GMT functionality featuring the brand’s first mechanical GMT movement created specifically for diving applications. Limited to 500 pieces for the U.S. market, this showcases Calibre 6R54 with exceptional 72-hour power reserve, the longest of any Seiko mechanical watch, whilst the dramatic vertically gradated blue-green dial reflects views from above and below water.

At 42mm with 12.9mm thickness, this provides substantial diving GMT presence through stainless steel construction with super-hard coating that ensures durability for depths to 200 metres. The Made-in-Japan black ceramic unidirectional bezel with knurled edge provides enhanced operability whilst the rich turquoise dial creates distinctive visual depth through vertical gradation effects.

The Calibre 6R54 delivers revolutionary 72-hour power reserve through 24-jewel automatic construction operating at 21,600 vibrations per hour with manual winding capability. The GMT hand adjusts independently in one-hour increments without interrupting main timekeeping, enabling rapid time zone changes essential for international travel whilst maintaining diving functionality.

The bronze-tone GMT hand and large LumiBrite markers ensure optimal legibility whilst the anti-reflective sapphire crystal and screw-down crown provide professional diving protection. The three-link bracelet with tri-fold clasp and extender accommodates wetsuit wear.

This Prospex 1968 Heritage Diver’s GMT suits collectors seeking authentic Japanese diving heritage with innovative GMT capability and exceptional power reserve. The limited 500-piece U.S. production and distinctive turquoise dial create unique character whilst the 72-hour autonomy represents significant advancement in Seiko mechanical watchmaking.