The Cartier Ballon Blue collection debuted in 2007 with a sleek and rounded case design. Its standout features include the unique recessed crown and the subtle dent it creates on the dial. This particular model, WE902078, boasts a stainless steel case adorned with a diamond-set bezel and a silver dial. Its self-winding movement, caliber 049, does not display the date and is paired with a stainless steel and pink gold bracelet.