Exterior

Case Material : Stainless steel
Glass Material : Sapphire crystal
Glass Coating : Anti-reflective coating on inner surface
Case size : Diameter 37 mm × Thickness 12.4 mm
Clasp type : Fold over clasp with push button release
 

Functions

Water resistance : 10 bar
Magnetic resistance : 4800 A/m (60 gauss)
Weight : 140.0 g
Other details / Features : 

• Solid case back with Grand Seiko’s lion emblem
• Date display
• Screw case back
• Stop second hand function

Movement

Caliber no. : 9S55
Movement Type : Automatic with manual winding capacity
Accuracy : +10 seconds per year