Watch Specification Model:SD1957 Movement: Japan NH35 automatic movement Case material:316L stainless steel Case back: 316L stainless steel Bezel: Unidirectional Rotationalceramic bezel Watch mirror: sapphire crystalwith AR coating. Water resistance: 300 m / 30 ATM Luminous: Swiss C3super luminous, Green light Crown: Screw-Down Case back:Screwback Case back Watch Dimension Case diameter:42.5mm(without crown) Case length: 49.5mm(lug to lug) Case thickness: 15.75mm 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