SPB321 slug_ASTRONTI12 screwdown see-through caseback and 24-jewel

screwdown see-through caseback and 24-jewel automatic movement

deep green sunray finish dial

and offers a black uni-directional rotating elapsed timing bezel in scratch-resistant ceramic

one a 24-hour indicator

and a screwdown see-through caseback for a view of classic timekeeping in action

SPB321 slug_ASTRONTI12 screwdown see-through caseback and 24-jewelProspex Automatic Diver's Watch. 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. Based on an iconic Seiko design, with upgraded materials, this