Cartier Tortue Perpetual Calendar Watch - 45.6 mm White Gold Case - Black Alligator Strap - W158004845. 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

Date by Hand in 6

brown semi-matte alligator leather strap

crown set with a cabochon sapphire

45 mm satin-finished polished 18K King gold case

mat black and blue dial with yellow and white luminescent indexes

silver dial with blued steel sword shaped hands

black rubber-gummy alligator strap with deployant buckle

silver opaline dial with Roman numerals and date at 3 o'clock

48 mm microblasted black ceramic case

1 mm white gold case set with brilliant-cut diamonds

retrograde second time zone at 10 o'clock

brown Tropical composite strap