SPB299 slug_Speedtimer3 features the first see-through screwdown

features the first see-through screwdown caseback on a Seiko diver’s watch

Radio signals are received automatically to adjust the time and calendar throughout 25 world time zones

and a power reserve of approximately 41 hours

and curved sapphire crystal with anti-reflective coating on the inner surface

the black dial

SPB299 slug_Speedtimer3 features the first see-through screwdown1968 Heritage Diver's Save the Ocean Special Edition. Designed for those who treat life as the ultimate adventure, the Seiko Prospex line meets every challenge with technological excellence and style. Part of a rich legacy of innovation in high intensity timekeeping, Prospex continues to celebrate a long history of sports watch excellence with re creations and re interpretations of landmark achievements. Inspired by the intricacies of glacial