Grand Seiko SBGM221

Exterior

Case Material : Stainless steel
Glass Material : Box shaped sapphire crystal
Glass Coating : Anti-reflective coating on inner surface
Case size : Diameter 39.5mm Lug-to-lug 46.9mm Thickness 13.7mm
Clasp type : Three-fold clasp with push button release

Movement

Calibre no. : 9S66 Instructions
Movement Type : Automatic with 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 : 88.0 g
Other details / Features :

・24-hour hand (dual time display function)
・35 jewels
・Calendar-linked time difference adjustment function
・Case back with 6 screws
・Case back with lion emblem
・Date display
・See-through case back
・Stop seconds hand function