Cartier Rotonde de Cartier Perpetual Calendar Watch - 40.5 mm Gold Case - W155621840. 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

45 mm polished and smoked sapphire crystal case

composite resin lateral inserts and bezel lugs

Water resistant to 300 meters

slate dial

bezel set with 72 diamonds (~0

45 mm polished blue sapphire crystal case

manual winding calibre 9907 MC movement with chronograph function

63mm thick

cognac leather strap with gold deployable clasp

caliber 25-21 REC manually wound movement

brown alligator leather strap with 18K Everose gold folding Oysterclasp

3D carbon fiber bezel 3d carbon fiber and 6 H-shaped titanium screws