Cartier Rotonde de Cartier Annual Calendar Watch - 40 mm White Gold Case - Grey Dial - Black Alligator Strap - WHRO000340mm 18K white gold case, 13. 26mm thick, 18K white gold crown set with a blue sapphire, sapphire crystal, grey dial with blued steel sword shaped hands, self winding movement annual calendar complication with days indicated by a hammer shaped hand and months by a disc, large date at 12 o'clock, approximately 48 hours of power reserve, black alligator skin strap, 18K white gold buckle with double adjustable folding. Water resistant to 30 meters.