Watch Specification Model:SD1928 Movement: Japan NH35 automatic, 41 hours of energy storage. Case back: 316L stainless steel Case material:316L stainless steel Watch mirror: sapphire crystalwith AR coating. Water resistance: 200 m / 20 ATM Luminous: Swiss C3, Greenlight Crown: Screw-Down Case back: Screwback Case Watch Dimension Case diameter:39mm(without crown) Case length: 49mm(lug to lug) Case thickness: 12mm Lug width: 20mm Our service Warranty: 2years Returns and Refund: 30 days return & refund service Package: watch,warranty card, user manual, plastic protecting box Style: mens mechanical watch, mens automatic watch, dive watch, luxury watch