Cartier Tortue Perpetual Calendar Watch - 45.6 mm White Gold Case - Black Alligator Strap - W1580048 51 caliber 9901 self-winding Co-Axial master

caliber 9901 self-winding Co-Axial master chronometer movement with chronograph and date functions

black lacquered polished dial with

approximately 24 months of power reserve

diamond-set 18K white gold pin buckle

and day display

Cartier Tortue Perpetual Calendar Watch - 45.6 mm White Gold Case - Black Alligator Strap - W1580048 51 caliber 9901 self-winding Co-Axial master45. 6mm x 51mm 18K white gold case, 16mm thick, sapphire back, octagonal crown set with a sapphire, sapphire crystal, slate dial with openwork satin brushed silvered grid, sunray finish, black transferred Roman numerals, snailed counter, apple shaped blued steel hours and minutes hands, caliber 9422 MC automatic movement , perpetual calendar with days displayed by a retrograde hand, and months and leap years in a counter at 12 o'clock, approximately