Watch Specification Model: SD1974 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 transparent AR coating. Water resistance: 200 m / 20 ATM Luminous: Swiss C3 green and BGW9 blue super luminous. Crown: Screwdown Crown Case back: Screwback Case Watch Dimension Case diameter: 43.8mm ( without crown) Case length: 46.8mm (lug to lug) Case thickness: 13.5mm Lug width: 20mm Our service Warranty: 2 years Returns policy: Please check the website“Return / Exchange / Warranty Policy” Style: automatic watch, dive watch, luxury watch Package: watch, box, warranty card, user manual Service: Support retail, wholesale. OEM/ODM. Please contact the seller if necessary.