Omega Men's 1501.10.00 Constellation Double Eagle Automatic Chronometer Watch Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Domed, anti-reflective scratch-resistant sapphire crystal Case diameter: 35 mm Stainless-steel case; Gold dial; Date function Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving