Seiko Prospex Automatic Diver Blue Dial Men's Watch SPB321

Seiko Prospex Automatic Diver

Reference: SPB321


Prospex Automatic Diver's Watch Re-Interpretation. 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 recreations and reinterpretations of landmark achievements. Based on an iconic Seiko design, with upgraded materials, this automatic diver's watch is crafted of stainless steel with durable super-hard coating, and offers a blue uni-directional rotating elapsed timing bezel in scratch-resistant ceramic, a sapphire crystal with anti-reflective coating on the inner surface, a screwdown crown and caseback, and a tri-fold clasp with push-button release, secure lock and extender. The distinctive press-patterned gradated blue dial features a date calendar and LumiBrite hands and markers. Following ISO standards for scuba diving to depths of up to 200 meters, this exceptional timepiece includes a 24-jewel automatic movement with a frequency of 21,600 vibrations per hour, a power reserve of approximately 70 hours, and manual winding capability. 200m Water Resistant


Gender: Men's

Case Dimensions:

  • Thickness: 12.9mm
  • Diameter: 45.0mm
  • Length: 52.6mm

Case Material: Stainless steel case with super-hard coating

Case Back: Screwdown recessed crown and caseback

Crystal: Sapphire crystal with anti-reflective coating on the inner surface

Water Resistance: 200 meters (660 feet), follows ISO standards and is suitable for scuba diving

Dial Color: Blue

LumiBrite: LumiBrite hands and markers

Bracelet/Strap: Stainless steel bracelet with super-hard coating

Clasp: Tri-fold clasp with push button release, secure lock and extender

Distance between lugs: 20

Movement: Automatic with manual winding capability

  • Caliber 6R35
  • 21,600 vibrations per hour
  • 24 jewels
  • Power reserve: approximately 70 hours
  • Precision: +25 to -15 seconds per day


  • Stop second hand function
  • Date display


  • Unidirectional rotating bezel
  • Screw-down crown
  • Three-fold clasp with secure lock
  • Screw case back

Warranty: Manufacturer's warranty