Rotonde de Cartier Astromystérieux watch, 43.5 mm, Manufacture mechanical movement with manual winding, caliber 9462 MC. 18K pink gold case, 18K pink gold beaded crown set with a blue sapphire cabochon, guilloché dial, apple-shaped hands. Strap in black alligator leather, with 18K pink gold double adjustable folding buckle. Astromystérieux complication: mysterious central tourbillon, consisting of the escapement, balance, main geartrain and barrel, and completing one full revolution in one hour. Individually numbered movement consisting of 408 parts including 188 ball bearings and 25 jewels. Movement diameter: 39 mm, movement thickness: 5.9 mm, balance: 21,600 vibrations/hour, power reserve approx. 55 hours. Sapphire crystal case back. Case thickness: 12 mm. Water-resistant up to 3 bar (approx. 30 meters/100 feet).