Gustave Fischweiler studied at the Academy of Fine Arts of Namur from 1925-29, and then at the Royal Academy of Fine Arts in Brussels, attending there from 1929-32. He then served with the Regiment 13th line in Namur in 1932-33. Fischweiler later worked in medals, mostly by the method of strikes and spanning, creating more than 100 medals with different motives such as automobiles, portraits, sports and animals. However, he also worked as a sculptor and painter. Fischweiler was not able to fully support himself as an artist, however, so he also worked as a banker in Brussels for many years. He won numerous awards for medals and modeling in his native Belgium. For instance, in 1937 he was awarded the Sculpture Prize of the Bruxelles Academy of Fine Arts.