Watch Specification Model: SF791 Movement: Japan NH34 GMT movement Case material:316L stainless steel Case back: 316L stainless steel Watch mirror: bubble sapphire crystal with AR coating. Water resistance: 200m / 20 ATM Crown: Screwdown Crown Case back: seethrough Case Note: The GMT hand is blue, because it reflects when taking pictures, it looks like black. Watch Dimension Case diameter:40mm ( without crown) Case length: 47mm (lug to lug) Case thickness: 12.95mm Lug width: 19mm Our service Warranty:2 years Returns policy:30-day return and refund. Style: automatic watch, dive watch, luxury watch Package: watch, box,warranty card, user manual