====== Cartier Rotonde de Cartier Central Chronograph ====== {{wst>image_cr|Cartier|Rotonde de Cartier Central Chronograph}} {{wst>image_cr|Cartier|9907 MC}} [[Chronograph]] by [[Cartier]] Thanks to its vertical coupling the calibre 9907 MC is a truly innovative system. The watchmakers at Cartier have replaced the classic horizontal trigger mechanism, which is fixed to a lateral tilting and requires a lot of energy, by a vertical and in its design very modern variant. Instead of a gear mechanism a mechanism working via friction is used. **Movement:** * [[Manufacture]] [[chronograph]] movement [[Cartier 9907 MC|Calibre 9907 MC]] * [[Column-wheel]] control **Case:** * 18 ct [[red gold]] * Ø 42 mm * [[Sapphire crystal]], caseback with [[sapphire crystal]] * [[Perlaged]] crown in 18 ct red gold, decorated with a sapphire [[cabochon]] * [[Waterproof]] to 3 atm * Individually numbered **Dial:** * [[Silver]], [[guilloche]], black * Roman numerals * [[Blued]] hands **Functions:** * Hours, minutes * Central [[chronograph]] (mono-pusher) **Bracelet:** * Black alligator leather strap * [[Folding clasp]] in 18 ct red gold {{tag>Watch_models Chronographs Cartier_models}}