Grand Seiko Heritage
External
Exterior: Stainless steel Caseback: Stainless steel and sapphire glass
Back cover specifications: Transparent screw back cover
Crystal material: Box-shaped sapphire
Coating: Internal anti-reflective coating
Case size: Width 38.8mm Height 43.7mm Thickness 10.4mm
Strap width: 19mm
Strap material: Alligator leather
Movement
Movement: 9SA4 Description
Drive system: Mechanical manual winding