Seiko SPB121J1

Technical specifications

Movement

• Calibre: 6R35
• Movement type: Automatic, can also be wound by hand
• Accuracy: +25 to -15 seconds per day
• Power reserve: Approx. 70 hours
• Jewels: 24
• Functions:
  • Hacking seconds hand (stops when the time is set)
  • Date

Case and bracelet

• Case material: Stainless steel
• Case size:
  • Thickness: 13.2 mm
  • Diameter: 39.5mm
  • Lug-to-lug: 46.4 mm
• Glass: Sapphire crystal with magnifier
• Glass coating: Anti-reflective coating on the inner surface
• LumiBrite: Lumibrite on hands and hour markers
• Strap material: Cowhide leather
• Clasp: Folding clasp with push button
• Lug width: 20mm

Other details

• Water resistant: 20 bar
• Magnetic resistance: 4.800 A/m
• Weight: 87.0g
• Features:
  • Inner rotating compass ring
  • Screw-down crown
  • Transparent screw-down case back