SEIKO PROSPEX DIVER SPB187J1

The Seiko Prospex SPB187J1is a 1968 automatic diver's watch re-interpretation, also referred to as the MM200 reduced. It features a blue dial and a high-beat automatic movement. 

Movement

• Caliber: 6R35, an in-house, automatic movement with manual winding capability.
• Power Reserve: Approximately 70 hours.
• Accuracy: +25 to -15 seconds per day.
• Jewels: 24.
• Other features:
  • Stop second hand function.
  • Date display. 

• Case material: Stainless steel with a super-hard coating.
• Case dimensions:
  • Diameter: 42mm.
  • Thickness: 12.5mm.
  • Lug-to-lug length: 48.8mm.
• Crystal: Sapphire crystal with an anti-reflective coating on the inner surface.
• Luminescence: Lumibrite on hands, indexes, and bezel.
• Bezel: Unidirectional rotating bezel with a black aluminum insert.
• Crown: Screw-down crown.
• Case back: Screw case back.
• Water resistance: 200m / 660ft suitable for diver's use.

• Bracelet material: Stainless steel.
• Clasp: Three-fold clasp with a secure lock, push-button release, and extender.
• Bracelet length: 200mm. 

• Weight: 186g.
• Magnetic resistance: 4,800 A/m.