Grand Seiko Heritage

Exterior
Exterior: Bright titanium Case back: Bright titanium and sapphire glass
Case back specifications: See-through screw back
Glass material: Dual curve sapphire
Coating: Anti-reflective coating on inner surface
Case size: Width 40.0mm Height 47.9mm Thickness 11.8mm
Band width: 22mm
Clasp: One-push three-fold type
Wrist circumference (maximum): 195mm
Movement
Movement: 9RA2 Instructions
Drive system: Spring drive automatic winding (with manual winding)
Drive period: Approximately 120 hours (approximately 5 days) when fully wound
Accuracy: Average monthly difference ±10 seconds (equivalent to daily difference ±0.5 seconds)