Overview These ‘Black Bay’ inspired watches hark back to the classic military watches of the late 1950s. The watch has a screw-down crown, but the absence of crown guards gives the watch a sleeker, more elegant, vintage feel. Watch Specification Model: SD1958 Movement: Japan NH35 automatic, 41 hours of energy storage. Case material: 316L stainless steel Case back: 316L stainless steel Bezel:120 Click unidirect rotational ceramic bezel Watch mirror: sapphire crystal with AR coating. Water resistance: 200 m / 20 ATM Luminous: Swiss BGW9 blue super luminous. Crown: Screw-Down Case back: Screwback Case Watch Dimension Case diameter: 41.1mm(without crown) Case length: 49.7mm(lug to lug) Case thickness: 14.85mm Lug width: 22mm 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