This violin is Labeled Johann Baptist Schweitzer 1844 Repaired by M Nebel New York c 1895. Johann Baptist Schweitzer was considered one of the finest violin makers in Vienna. He adopted a more classical approach to classical models, emulating Amati and Stradivari patterns with some authenticity. M. Nebel & Bros was established by the Nebel Brothers Martin, and Andrew Nebel who specialized in making and restoring violins.
The Alois Bittner Violin made in 1932 in Prague, Czechoslovakia. Alois Bittner Alois Bittner was born in 1880 in Kral Pola, Czech Republic. He was a student of Franz Angerer and was awarded at various exhibitions with numerous distinctions due to his strong personal style and still very clean craftsmanship.
Check out this Ryszard Osowski Violin Bronze Plus. Ryszard Osowski is a Polish luthier who gradually perfected the sound and quality of his instruments. As a result, he concentrated more on building his own stringed instrument, passionately pursuing crafting highly advanced violins.