Grand Seiko SBGW231

Exterior

Case Material : Stainless steel
Glass Material : Box shaped sapphire crystal
Glass Coating : Anti-reflective coating on inner surface
Case size : Diameter 37.3mm Lug-to-lug 44.3mm Thickness 11.6mm

Movement

Calibre no. : 9S64 Instructions
Movement Type : Manual winding
Power reserve : Approx. 72 hours(3 days)
Mean daily rate : +5 to -3 seconds per day
Normal usage accuracy : +10 to -1 seconds per day

Functions

Water resistance : Splash Resistant
Magnetic resistance : 4,800 A/m
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