Gustav Dietl was a luthier from the village of Schönbach in what is now Czechia. He was born there in 1882 and completed his apprenticeship under Josef Neudörfer from 1906-1909 before attending the violin-making school in his home town from 1910-1911. In 1919, he opened his own workshop, where it appears that he primarily sold his own premium-quality instruments. It is not known whether he, like his teacher, also accepted commissions and partial pieces for other workshops and merchants. He left Schönbach in 1956 and moved to Walldorf. He used handwritten labels.