Art Deco all enameled up by Frenchman Jean Goulden who lived into the 1940’s. Starting out as a physician, he took to enamelwork on decorative objects instead. So lucky we are that he did.

Multi-colored box. 1920's to 1930's.
Multi-colored box. 1920’s to 1930’s. Copper and Champlevé Enamel. Image © 1stdibs, Inc. 2019. Fair use license. via https://www.1stdibs.com/furniture/decorative-objects/boxes/jean-goulden-french-art-deco-copper-champleve-enamel-multi-colored-box/id-f_819247/
Clock. 1928.
Clock. 1928. Silvered bronze and colored champlevé enamel. Image © Cooper Hewitt Museum. Fair use license. via https://collection.cooperhewitt.org/objects/907130271/
Box. ca. 1930.
Box. ca. 1930. Enameled metal. Image © CHRISTIE’S 2019. Fair use license. via https://www.christies.com/lotfinder/Lot/jean-goulden-1878-1946-a-box-circa-5644941-details.aspx