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.Reference WE900551 has a pink gold case with diamond-set bezel and a silver dial. It is powered by the self-winding caliber 049 (no date) and fitted with a leather strap.
