Cartier Rotonde de Cartier Astrotourbillon Cristal de Carbone Watch - 47 mm Niobium-Titanium Case - W1556221

47mm niobium-titanium case, 15.5mm thick, beaded crown set with a black spinal cabochon, sapphire crystal, slate-gray galvanized dial with satin-finish sunray effect, white transferred Roman numerals, rhodiumized steel sword-shaped hands with superluminova coating, 9460 MC self-winding movement with astrotourbillon complication and carriage rotating around the dial in 1 minute, tourbillon carriage and escapement in carbon crystal requiring no regulation or lubrification, approximately 48 hours of power reserve, black alligator strap, 18K white gold double adjustable folding buckle. Water resistant to 30 meters.