Rotonde de Cartier Astrotourbillon Carbon Crystal watch
Rotonde de Cartier Astrotourbillon, 47 mm, Manufacture mechanical movement with manual winding 9460 MC. Niobium-titanium case, beaded crown set with a black spinel cabochon, slate-grey galvanised dial with satin-brushed sunray effect, white transferred Roman numerals, sword-shaped hands in rhodium-finish steel with superluminova coating. Strap in black alligator skin, double adjustable folding buckle in 18K white gold. Astrotourbillon complication with carriage rotating around the dial in 1 minute, tourbillon carriage and escapement in carbon crystal requiring no regulation or lubrification. Individually numbered movement comprised of 249 parts, including 17 jewels. Movement diameter: 40.1 mm, movement thickness: 9 mm, balance: 21,600 vibrations/hour, power reserve approx. 48 hours. Sapphire case back. Case thickness: 15.5 mm. Water-resistant to 3 bar (30 metres/100 feet).