Watch Specification Model: SD1953 Movement: Japan NH35 automatic, 41 hours of energy storage. Case material: 316L stainless steel Case back: 316L stainless steel Bracelet: 316L stainless steel, non-polish link Bezel:120 Click unidirect rotational ceramic bezel Watch mirror: sapphire crystal with AR coating. Water resistance: 300 m / 30 ATM Luminous: Swiss BGW9 super luminous, blue night light. Crown: Screw-Down Case back: Screwback Case Watch Dimension Case diameter: 41mm(without crown) Case length: 48mm(lug to lug) Case thickness: 13.5mm Lug width: 20mm