Ulysse Nardin Classic Perpetual Ludwig Watch41mm stainless steel case, screw down security crown crown, sapphire crystal, month and day of the week in the center of the dial, Caliber UN 33 movement with perpetual Calendar, big date display in a double window, month and day of the week in the center of the dial, years in a double window at 6 o'clock, small seconds at 9 o'clock, leather strap, simple buckle. Water resistant to 30m.