2Jewellery Personalized Men's Watches, Sapphire crystal, rubber strap with folding clasp. Movement: H25.01r manual tourbillon Model: 1903-H Drive mode: single spring drive Power reserve: 50 (hours) Vibration frequency: 21600 (times/hour) Winding method: manual winding Jewel Bearings: 21 Case thickness: 16.5mm Strap width: 20-25.5mm Case Material: carbon fiber material Strap Material: Rubber Waterproof depth: 3ATM Glass material: synthetic sapphire crystal Buckle style: Butterfly double snap Crown: Straight