While many fixate on the blue cabochon, Ballon Bleu de Cartier ref. W6900356 hides its greatest detail in plain sight: a double-convex pebble profile. The 18K yellow gold case forms a smooth, double-curved silhouette that sits close against the wrist, creating an effortless fit often missed on paper. Look closer at the silvered dial and see the signature crown guard actually dips into the dial’s perimeter, warping the inner minute track into a unique oval path around the blued-steel hands. Driven by a self-winding Caliber 049, this 36mm reference offers a deceptively complex profile on a classic brown leather strap.

Offered pre-owned, this Cartier Ballon Bleu 36 18K Yellow Gold Watch W6900356 comes complete with its official paperwork and manufacturer’s box.

Introduced in 2007, the Cartier Ballon Bleu brought a distinctive rounded shape to the brand’s collection, with its signature crown tucked into a curved recess at 3 o’clock. Ref. W69011Z4 features a 36mm stainless steel case paired with a silver guilloché dial, where fine engraved lines radiate from the center beneath Cartier’s blued-steel sword hands. Internally, a Swiss quartz movement offers hassle-free, grab-and-go performance. This midsize, time-only reference keeps the Ballon Bleu’s design easy to wear across a range of wrist sizes and occasions.

Offered pre-owned, this Cartier Ballon Bleu 36 Stainless Steel Watch W69011Z4 comes with papers and a gift box.