The new Seiko Prospex Alpinist GMT SPB377 powers by new Caliber 6R54 with a power reserve of three full days.
Automatic with manual winding capacity Caliber 6R54 GMT
Power reserve: 72 hours; Jewels: 24
Accuracy: +25 to -15 seconds per day
Stainless steel case (super hard coating)
D39.5 mm x L46.4 mm x T13.6 mm
Lumibrite on hands and indices
Date display at 3 o’clock position
Sapphire crystal with anti-reflective coating on inner surface and magnifier
Water resistance: 200 m
Leather strap with three-fold clasp & push button release
Screw-down crown and case back
See-through case back
Rotating compass inner ring
Stop second hand function