Cartier Ballon Bleu de Cartier 36mm W69017Z4 2017 [Preowned]Overview The Cartier Ballon Bleu 36mm W69017Z4 is a refined expression of Cartiers timeless design, offering a perfect balance between elegance and modern sophistication. Its rounded stainless steel case, with smooth, polished curves, creates a distinctive silhouette that embodies the floating, weightless aesthetic of the Ballon Bleu collection. One of its most recognizable features is the integrated blue cabochon crown, which sits within the