Germanic violin, 1921

Germanic violin bearing a label that is a round paper label with a cross, the initials "JMJ" (Jesus, Mary,Joseph?) with the M being bisected by the cross, and "WBF" below, in gothic lettering, dated 1921 below with the 21 handwritten.  No cracks or repairs that I could see, please see pictures. The case is leather with a "Bulls Head" trademark with a F&F indicating the manufacture as The Felsberg company between 1920 and 1928. The case is not original to the violin. There is no key. A German made bow is included. The violin is approximately 23" overall.