Hundreds of thousands of these copies were made in Germany, France, central and eastern Europe, England, China, and Japan, starting in the mid-19th century and continuing into current times – and literally millions exist today. They bear counterfeit labels proclaiming them to be by not only Stradivari but Vuillaume, Amati, Bergonzi, Guarneri, Gasparo da Salo, Stainer, and others.
You should have it appraised by an expert, and most such experts are members of the American Federation of Violin and Bow Makers. Expect to pay for the appraisal. The authentication of a violin can be determined only by a careful examination of such factors as the design, model, craftsmanship, wood, and varnish. It takes a well-trained violin appraiser to be able to attribute the violin to a specific maker or place of manufacture.
Don’t expect your find to be genuine. The odds against finding the real thing are slim to none. Nevertheless, you might have a decent violin.
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best.............Ti m