Stemming from the days of Louis Cartier, the Ronde de Cartier is defined by Roman numerals, blue sword-shaped hands, and a sapphire cabochon. Its hand-winding mechanism, crowned with a track minute circle, makes it a true staple of timeless elegance. This elegant ref. 0900 from the early 1990s, is an unusually round-shaped Cartier, made in an ultra-thin 18k yellow gold case. Fitted with a shiny black alligator strap and the original 18k yellow gold folding clasp.