Exterior: High-intensity titanium Case back: Screw case back Glass Material: Sapphire crystal Glass Coating: Anti-reflective coating on inner surface LumiBrite: LumiBrite on hands, index(es) and bezel Case size: Diameter 43.8mm Lug-to-lug 51.5mm Thickness 13.8mm Band width: 23mm Clasp type: Three-fold clasp with secure lock & push button release, solid & slide adjuster The perimeter of Band: 185mm Movement Caliber no.: 9RA5 Instructions Movement Type: Spring Drive Accuracy: ±10 seconds per month (±0.5 second per day) Functions Magnetic resistance: 4,800 A/m Other details / Features: Unidirectional rotating bezel Screw-down crown Three-fold clasp with secure lock Power reserve indicator