Seiko Prospex Limited Edition SPB257J1

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Seiko Prospex Limited Edition SPB257J1

The Black Series Limited Edition 1970 Mechanical Diver’s Modern Re-interpretation. Caliber 6R35 automatic and manual winding movement. Power reserve 70 hours. Central seconds hand on black dial, index hour markers. 42mm stainless steel case. Sapphire crystal on top and solid case back. Water resistant to 100M. Presented on nylon strap with one additional silicon strap included. Limited to 5,500 pieces worldwide.


Caliber Number 6R35
Movement Type Automatic with manual winding
Precision +25 to -15 seconds per day
Power reserve Approx. 70 hours
Jewels 24
  • 24 jewels
  • Stop second hand function
  • Date display


Case Material Stainless steel (hard coating)
Case Size
  • Thickness: 13.2mm
  • Diameter: 42.7mm
  • Lug-to-lug: 41.6mm
Crystal Sapphire crystal
Crystal Coating Anti-reflective coating on inner surface
LumiBrite LumiBrite on hands, index(es) and bezel
Band Material Polyester
Bracelet Length 260.0mm
Distance between lugs 20mm

Other Details

Weight 106.0g
  • LIMITED EDITION on the case back
  • Serial number engraved on the case back
  • Screw case back
  • Unidirectional rotating bezel
  • Screw-down crown
  • An additional silicone strap is included