2Jewellery Men's Watches Brands Movement: 1HC5 automatic movement Movement Model: 2203 Drive: single-spring drive Power reserve: 72h Vibration frequency: 28800 (times/hour) Winding method: automatic winding Case Diameter: 4454mm Case thickness: 17mm Strap width: 20*26mm Case material: crystal glass, stainless steel Strap Material: Rubber Waterproof depth: 30 meters life waterproof Mirror: Synthetic sapphire glass Caseback:Synthetic sapphire glass Crown: straight in