Riedenschild Advance Pro Mechanical Wind Chronograph Watch Model 1117-01 for Men with Black Dial Chronograph that features a Gematic 30 Jewel movement, scratch resistant sapphire crystal, large distinctive crown, solid 316L stainless steel case at 41mm diameter and 12mm thick, screw down display back, luminous treated hands, black genuine leather and water resistant to 50m/165ft.