In 2007, Cartier introduced the Ballon Blue line, featuring a sleek and rounded case. One of its standout features is the protected crown, which creates a unique dent in the dial. The Extra Flat 46mm was added in 2011, followed by the Extra Flat 40mm at SIHH 2015. The HPI00683 model boasts a 46mm white gold case housing a hand-wound caliber 9452MC with a flying tourbillon. The luxurious details continue with 114 baguette-cut diamonds (4.80 carats) on the case, 120 baguette-cut diamonds (2.52 carats) on the dial, and a dazzling 344 baguette-cut