The SPB377 is Seiko's modern Alpinist with a true GMT: the Caliber 6R54 automatic adds a red-tipped 24-hour hand and a fixed 24-hour bezel to the line's inner rotating compass ring. The 39.5mm steel case, curved sapphire crystal, screwdown crown and 200m water resistance make it a genuine outdoor watch that still wears neatly under a cuff. Its 72-hour power reserve and 24-jewel movement beat most GMTs at this level, which usually run shorter reserves and lesser finishing. Owners rate it very highly, praising the blue sunray dial and the value of a mechanical GMT with a compass bezel; the main complaints are the 13.6mm thickness and the leather strap, which many swap for a bracelet.
In stockReturn policy
Owners rate the SPB377 very highly, calling it one of the best-value mechanical GMTs around. They single out the blue sunray dial, the legible Alpinist dial layout and the long power reserve. The recurring gripes are the case thickness and the leather strap.
The Seiko Prospex Alpinist GMT SPB377 draws on the 1959 Alpinist, Seiko's first sports watch, and adds GMT functionality. It keeps the original's wedge-shaped markers, bold numerals and distinctive hands. The dial is blue with a sunray finish, and the GMT hand has a red tip.
A 24-hour GMT bezel surrounds the dial. An inner rotating compass bezel is there for hiking and other outdoor use. LumiBrite coating on the hands and markers improves visibility.
The stainless steel case has a super-hard coating, a screwdown crown and a see-through screwdown caseback. A curved sapphire crystal protects the dial and has anti-reflective coating on the inner surface. Inside is Seiko's Caliber 6R54 automatic GMT movement with a date calendar. The watch has a blue leather strap with a tri-fold push-button release clasp.
