Cartier Tortue XXL Multiple Time Zones Watch - 51 mm White Gold Case - Black Alligator Strap - W158005051mm x 45. 6mm 18K white gold case, 17. 2mm thick, octagonal in 18K pink gold crown set with a sapphire, sapphire crystal, silvered dial with white galvanized guilloche, openwork grid with sunray effect and transferred blue oceans, caliber 9914 MC automatic movement , multiple time zones complication taking account of summer and winter time, cities disc and day night indication, approximately 48 hours of power reserve, black alligator strap, double