Description: Ballon Bleu De Cartier WE9004Z3 Pre-owned Ballon Bleu de Cartier ref WE9004Z3. The Ballon Bleu de Cartier is one of the brand’s more modern icons, introduced in 2007 with a completely different look from the traditional Santos or Tank. Softer, rounder, and more fluid, it’s defined by that integrated crown guard that curves into the case, giving the watch its “balloon” shape. It feels elegant yet a bit more contemporary, which is why it’s become such a