Exterior: Stainless steel Case back: Screw case back Glass Material: Dual-curved sapphire crystal Glass Coating: Anti-reflective coating on inner surface LumiBrite: Lumibrite on hands and index(es) Case size: Diameter 40.5mm Lug-to-lug 48.6mm Thickness 14.4mm Band width: 20mm Clasp type: Three-fold clasp with push button release The perimeter of Band: 192mm Movement Caliber no.: 9S66 Instructions Movement Type: Automatic with manual winding Power reserve: Approx. 72 hours(3 days) 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: +10 to -1 seconds per day Functions Water resistance: 20 bar Magnetic resistance: 4,800 A/m Weight: 180 g Other details / Features: Screw-down crown 35 jewels 24-hour hand (dual time display function) Calendar-link