Guy de VADIMON for CITROËN. Citroën onomatogram brooch, in gilt metal and 800 thousandths silver, featuring a 1930s Citroën coupé, set with red and blue synthetic stones (two loose). Circa 1930. Height 2.5 cm - Width: 6.5 cm Gross weight: 4.5 g Note : Created around 1928 by Parisian jeweler Guy de Vadimon, this onomatogram brooch was created following a competition launched by André Citroën, inviting artists and designers to imagine a work formed from the letters of the name CITROËN. This brooch perfectly embodies the spirit of innovation and modernity characteristic of the 1930s and Citroën's avant-garde communications.