Watch Specification: Model: SD1939SMovement: Japan NH35 automatic, 41 hours of energy storage.Case/Bezelmaterial:Germany CuSn8 bronzeBezel: non-rotatable Cusn8 bronze BezelWatch mirror: sapphire crystal with AR coating.Water resistance: 300mHelium Escape Valve Nobuckle: stainless steelLuminous: Swiss C3 green super-luminous lightWatch DimensionsCase diameter(without crown): 47mmLug to lug: 52mmCase thickness: 16.1mmband width: 24mmOur Service: Style: Automatic watch, dive Watch, Luxury Watch, bronze watchWarranty: 3 yearsReturns policy:30-day return and refundPackage: watch, box,warranty card, user manual