Stradivari also made harps, guitars, violas, and cellos--more than 1,100 instruments in all, by current estimate. About 650 of these instruments survive today. And only 5oo+ are violins. So yr chance of owning an authentic is very slim. In addition, thousands of violins have been made in tribute to Stradivari, copying his model and bearing labels that read "Stradivarius." Therefore, the presence of a Stradivarius label in a violin has no bearing on whether the instrument is a genuine work of Stradivari himself.
And I`m curiouc...does yr Strdi violin has the country`s origin printed on it?