My name is ***** ***** I'm happy to help you with this.
No, your violin is not a genuine Stradivarius. The location of every Stradivarius still in existence is known.
You have a workshop violin, made in a factory in Germany at the turn of the 20th century. Factories in Markneukirchen, Mittenwald and Klingenthal turned these out by the thousands, primarily for export. They are still considered to be good student violins today (not for concert performers).
If your violin is in very good condition with very good tone, Its current retail (replacement or insurance) value is approximately $800. If you were to sell it, you could expect to get the fair market (private sale or auction) value of 40% of the retail amount, or approximately $320, depending on location and actual condition.
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Thank you so much!
Sorry for the delay - I have been out of town for a week.