Exterior: Stainless steel Case back: See-through case back Case back with 6 screws Glass Material: Box shaped sapphire crystal Glass Coating: Anti-reflective coating on inner surface Case size: Diameter 39.5mm Lug-to-lug 46.9mm Thickness 14.1mm Band width: 19mm Clasp type: Three-fold clasp with push button release The perimeter of Band: 185mm Movement Caliber no.: 9S86 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. Functions Water resistance: Splash Resistant Magnetic resistance: 4,800 A/m Other details / Features: 37 jewels 24-hour hand (dual time display function)