Watch Specification Model: SD1957 Movement: Japan NH35 automatic movement Case material:316L stainless steel Case back: 316L stainless steel Bezel: Unidirectional Rotational ceramic bezel Watch mirror: sapphire crystal with AR coating. Water resistance: 300 m / 30 ATM Luminous: Swiss C3 super 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: 2 years Returns and Refund: 30 days return & refund service Package: watch, warranty card, user manual, plastic protecting box Style: men’s mechanical watch, men’s automatic watch, dive watch, luxury watch