Tourbillon Watches. Movement: CAL.027.16 Model: 8003 Drive: single spring drive Power storage: 50 (hours) Vibration frequency: 21600 (times/hour) Chain up mode: automatic chain up Case diameter: 42mm Case thickness: 13.3mm Band width: 22mm Material: 316L fine steel Material: Italian calf leather Waterproof depth: 50m waterproof Mirror surface: artificial sapphire Buckle: folding buckle Crown: Straight-in type  Â