Description: Ballon Bleu De Cartier Pre-owned Cartier Ballon Bleu de Cartier ref W4BB0024 (2025). Introduced in 2007, the Ballon Bleu was a departure from the sharp lines of the Tank and Santos. Everything about it is curved: the rounded case, the minute track, even the way the crown tucks into the side beneath its protective arc. It’s a watch designed to feel fluid on the wrist. This 36mm stainless steel model is a very desirable size, noticeable, but still refined. The bezel