Rotonde de Cartier watch

Rotonde de Cartier Astromystérieux watch, 43.5 mm, Manufacture mechanical movement with manual winding, calibre 9462 MC. Rose gold 750/1000 case, rose gold 750/1000 beaded crown set with a blue sapphire cabochon, guilloché dial, apple-shaped hands. Black alligator-skin strap, rose gold 750/1000 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 and case back. Case thickness: 12 mm. Water-resistant to 3 bar (approx. 30 metres).