43 mm case, open, readable dial, sapphire crystal, quality Swiss automatic movement, up to 80 hours of power reserve and an indicator on the dial to show how much power is left before the next winding. The DiaMaster Power Reserve really does have it all. Rado DiaMaster R14140026 has an Automatic movement, 43 mm case size, 10 Bar (100 meters) water resistance and Leather strap.