Product DescriptionMovement: Automatic mechanical movementModel : 1961Power reserve: 80 (hours)Vibration frequency: 28800 (times/hour)Drive: Single springWinding method: Automatic windingCase diameter: 41mmCase thickness: 11.8mmStrap width: 19.6×27.8mmCase material: 316L stainless steelWaterproof depth: 30M life waterproofStrap material: RubberMirror: Artificial sapphire glassBack cover: Artificial sapphire glassModel 1960 Feature:Super Luminous80 Hours Power reserveHigh Quality Polishing Case