Christian Dior Eau de Cologne has undergone several formulation changes over the years. The original fragrance was created in 1947 by perfumer Edmond Roudnitska, and subsequent formulations were released in 1966, 1983, and 2007. Each new formulation aimed to update and modernize the scent while still maintaining its classic character. Collectors and enthusiasts often seek out vintage formulations for their unique qualities and historical significance.