The Seiko 5 Sports SSK025 is a field-style automatic GMT with a 39.4mm black PVD-coated stainless steel case, a sandblasted black dial and a 24-hour bezel. It runs Seiko's in-house 4R34 movement with a 41-hour power reserve, hacking, manual winding and a GMT hand, shown through an exhibition caseback. It suits buyers who want a compact, legible travel watch with military looks without paying for a Swiss GMT. Against the larger 42.5mm SSK001 and similar Seiko 5 GMTs, it is smaller and more vintage-styled, but it uses Hardlex rather than sapphire and has 100m water resistance instead of a diver's rating.
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Owners rate the SSK025 highly, praising its compact size, legible military dial and the value of an in-house automatic GMT. Common complaints center on the Hardlex crystal and the modest water resistance rather than the movement.
The Seiko 5 Sports Automatic GMT SSK025 is inspired by the "trench" watches, vintage military pieces once worn in the field. It keeps the traits of the Seiko 5 Sports line, including manual winding and a hack function for precise time setting, and adds a GMT function.
The 39.4mm case is stainless steel with a black PVD coating and a brushed and polished finish. The black sandblasted dial sits behind a curved Hardlex crystal, with a brushed 24-hour bezel. It shows both 12-hour and 24-hour military time. The Arabic numerals and baton-style hands are luminous. The seconds hand and GMT hand have orange accents, and a minutes track runs around the outer dial. A date window is at 3 o'clock.
It is powered by Seiko's in-house automatic caliber 4R34, which is visible through the exhibition case back. The watch has a black calf-skin leather vintage-style NATO strap with a black PVD coated tang buckle.
