The Cartier Ballon Blue line was introduced in 2007. It features a smooth, pebble-like case. One of its signature elements is the recessed & protected crown and the ‘dent’ it causes in the dial. The Extra Flat 46mm was introduced in 2011, while the Extra Flat 40mm was introduced at SIHH 2015.Reference HPI00683 has a white gold case of 46mm, which houses its hand-wound caliber 9452MC with flying tourbillon. The case is set with 114 baguette-cut diamonds totaling 4.80 carats; the dial has 120 baguette-cut diamonds totaling 2.52 carats. Last but not least, the bracelet is set with 344 baguette-cut diamonds totaling 27.80 carats.
