Cartier Ceinture
Yellow Gold

The Cartier Octagon 78100 is a rare and distinctive take on Cartier’s signature design language. Crafted in yellow gold, its bold 25mm octagonal case frames a white dial adorned with black Roman numerals and blued steel hands, true to Cartier’s timeless aesthetic. Powered by a manual winding movement, this watch connects tradition with refined craftsmanship. Paired with a leather strap and sapphire crystal, it is both elegant and unusual — a design that stands apart from the more common Tank and Santos models. Produced around 1990 and presented in very good condition (without box or papers), it represents a collectible slice of Cartier’s design history.