Rotonde de Cartier Perpetual Calendar watch, 40.5 mm, Manufacture mechanical movement with automatic winding 9422 MC. 18K pink gold case, beaded crown set with a sapphire cabochon, white galvanized guilloche dial, silvered openwork satin-brushed grid with sunray effect and black transferred Roman and Arabic numerals, months and days of the week, blued-steel sword-shaped and hammer-shaped hands. Brown alligator-skin strap with double adjustable 18K pink gold folding buckle. Perpetual calendar complication with days indicated by a retrograde hand, month and leap year indicated in a counter at 12 o'clock. Individually numbered movement comprised of 293 parts including 33 jewels. Movement diameter: 32 mm, movement thickness: 5.88 mm, balance: 28,800 vibrations/hour, power reserve approx. 52 hours. Sapphire case back. Case thickness: 13 mm. Water-resistant to 3 bar (30 meters/100 feet).