Baume & Mercier Men's 8727 Riviera Automatic Chronograph Watch Quality Swiss Automatic movement; Functions without a battery; Powers automatically with the movement of your arm Scratch-resistant-sapphire crystal Case diameter: 41.5 mm Stainless-steel case; White dial; Date function; Chronograph functions Water resistant to 330 feet (100 M): suitable for snorkeling, as well as swimming, but not diving