Case Material : Stainless steel
Glass Material : Box shaped sapphire
Glass Coating : Anti-reflective coating on inner surface
Case size : Diameter 37.3mm× Thickness 11.6mm
Band Material : Crocodile leather


Calibre no. : 9S64    Instructions
Movement Type : Mechanical manual winding
Power reserve : Approx. 72 hours(3 days)
Accuracy : +5 to -3 seconds per day (when static) / +10 to -1 seconds per day (normal usage accuracy)


Water resistance : Splash Resistant
Magnetic resistance : Equipped
Weight : 61.0 g
Other details / Features :
  • ・24 jewels
  • ・Case back with 6 screws
  • ・Case back with lion emblem
  • ・See-through case back
  • ・Stop seconds hand function


A 3-day power reserve with lasting quality    

The watch has a 3-day power reserve and combines the latest in 
hairspring technology with an escapement developed through the MEMS 
technology to achieve high accuracy and stability when worn. 
The delicacy, strength and beauty of the movement can be enjoyed the exhibition case back.     

    Grand Seiko SBGW231