Description: Ballon Bleu De Cartier 36 WE900651 Pre-owned Ballon Bleu De Cartier 36 ref WE900651. The Ballon Bleu was introduced in the mid-2000s and quickly became one of the brand’s most recognizable collections, largely because of how the crown is designed. Instead of sitting proud of the case, the crown is set into a protective arc of the bezel, almost like it’s cradled by the case itself. That recessed design keeps the profile smooth, protects the crown, and gives the