Planet Watch Movement: CAL.3H35 Movement model: 1089 Drive: single spring drive Power storage: 42 (hours) Vibration frequency: 28800 (times/hour) Winding method: manual winding. Diameter of case: 40-42 mm Case thickness: 13.3 mm Band width: 20 mm Market visibility 20 mm Case Material: 316 L fine steel Band Material: Italian calfskin Waterproof depth: 30 m domestic waterproof Mirror: artificial sapphire Buckle: folding buckle Crown: straight in