Vincenzo Panormo (134-1813) was born in Sicily and worked in both London and Paris. He primarily worked in other luthiers' workshops, making copies of Stradivarius models.
If it is authentic and if it is in very good condition with very good tone, the current retail (replacement or insurance) value of your violin is approximately $114,000. If you were to sell it, you could expect to get the fair market (private sale or auction) value of approximately 40% of the retail amount or $45,600, depending on location and actual condition.
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