Movement Caliber Number 4R39 Movement Type Automatic with manual winding Power reserve Approx. 41 hours Jewels 24 Functions 24-hour hand Stop second hand function Case/Band Case Material Stainless steel Case Size Thickness:12.5mm Diameter:41.8mm Lug-to-lug:48.4mm Crystal Dual-curved sapphire crystal Clasp Deployment clasp with push button release Distance between lugs 20mm Other Details Water Resistance Splash Resistant Magnetic Resistance 4,800 A/m Weight 132.0g Features See-through case back Screw case back See-through & Screw case back