Cartier Rotonde de Cartier Perpetual Calendar Watch - 40.5 mm Pink Gold Case - W1556217 mother-of-pearl stainless steel pushpieces and screw-locked

stainless steel pushpieces and screw-locked crown

18K yellow gold octagonal crown set with a sapphire cabochon

matt dark brown alligator strap with fold-over buckle

40mm steel case

rhodiumized 18K white gold octagonal crown set with a brilliant-cut diamond

Cartier Rotonde de Cartier Perpetual Calendar Watch - 40.5 mm Pink Gold Case - W1556217 mother-of-pearl stainless steel pushpieces and screw-locked40. 5 mm by 13 mm thick 18K pink gold case, sapphire back, beaded crown set with sapphire cabochon, sapphire crystal, white dial with silvered open work grid, Roman and Arabic numerals with blued hands, caliber 9422 MC automatic movement with perpetual calendar complication, days indicated by a retrograde hand, months and leap years in a counter at 12 o'clock, brown alligator strap with 18K pink gold buckle, buckle double deployant. Water resistant to