Cartier Rotonde de Cartier Annual Calendar Watch - 45 mm White Gold Case - Slate Dial - Black Alligator Strap - W158000245 mm by 14 mm thick 18K white gold case, sapphire back, beaded crown set with sapphire cabochon, sapphire crystal, slate dial with silvered open work grid and Roman numerals with blued hands, caliber 9908 MC automatic movement with annual calendar complication, days and months indicated by a hand, large date at 12 o'clock, black alligator strap with 18K white gold buckle, buckle double deployant. Water resistant to 30 meters.