Cartier Rotonde de Cartier Perpetual Calendar Automatic 18kt White Gold Men's Watch W1580002. 18kt white gold case with a black alligator leather strap. Fixed bezel. Silvered openwork dial with blue sword-shaped hands and Roman numeral hour markers. Minute markers around the outer rim. Automatic movement with 48 hour power reserve. Caliber 9908 mc engine. Scratch resistant sapphire crystal. Beaded crown set with a cabochon sapphire. Skeleton case back. Case diameter: 45 mm. Case thickness: 14.05 mm. Round case shape. Deployment clasp with push button. Water resistant at 30 meters / 100 feet. Functions: month, date, day, hour, minute. Luxury watch.