Cartier Rotonde de Cartier Perpetual Calendar Watch - 40.5 mm Gold Case - W1556218 II Brand Audemars Piguet Series Royal

Brand Audemars Piguet Series Royal Oak Perpetual Calendar Model Number 26574ST

18mm thick

silver dial set with calendar aperture at 6 o'clock

octagonal crown set with a blue synthetic spinel

Cartier Rotonde de Cartier Perpetual Calendar Watch - 40.5 mm Gold Case - W1556218 II Brand Audemars Piguet Series Royal40. 5 mm by 13 mm thick 18K 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, black alligator strap with 18K white gold buckle, buckle double deployant. Water resistant to 30