Exterior Exterior: Stainless steel Case back: Screw case back Glass Material: Sapphire crystal Glass Coating: Anti-reflective coating on inner surface LumiBrite: LumiBrite on hands, indexes and bezel Case size: Diameter 43.8mm Lug-to-lug 51.0mm Thickness 14.7mm Band width: 22mm Clasp type: Three-fold clasp with secure lock & push button release, solid & slide adjuster The perimeter of Band: 190mm Movement Caliber no.: 9S85 Instructions Movement Type: Automatic with manual winding Power reserve: Approx. 55 hours Mean daily rate: +5 to -3 seconds per day Mean daily rate is a mean value of daily rates in a condition where the movement before assembly in a case is measured in six positions in a fixed manner under artificially controlled environment for 12 days. Normal usage accuracy: +8 to -1 seconds per day Functions Magnetic resistance: 4,800 A/m Weight: 206 g Other details / Features: Unidirectional rotating bezel Screw-down crown