High-End Men Watches Movement: CAL00820 Movement Model: 1016 drive double spring drive Power reserve: 60 (hours) Vibration frequency: 28800 (times/hour) Winding method: manual winding Case Diameter: 42 mm Case thickness: 14 mm Belt width: 22 mm Case Material: 316 stainless steel Strap material: Italian calfskin Waterproof depth: 30 meters life waterproof Mirror: artificial sapphire Buckle: Folding buckle Crown: straight in