Caliber Number4R36 Automatic - Powered By The Movement Of The Wearer Power reserveApprox. 41 hours Case MaterialStainless steel Band/Bracelet Strap - Leather Curved Hardlex Glass Lumibrite Hands & Markers Water Resistance 100 Metres Calendar Indicators Date, Day Of The Week Case Size Thickness 12.5 mm / Diameter : 36.4 mm / Length : 44.4 mm Weight 62g