Oris Men's 635 7560 4164MB Williams F1 Automatic Watch Quality Automatic movement; Functions without a battery; Powers automatically with the movement of your arms. Movement: ETA 2836-2 Scratch-resistant-sapphire crystal Case diameter: 40.5 mm Stainless-steel case; Black dial; Day-and-date functions. Water-resistant to 165 feet (50 M)