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Nicholas Diehl (sometimes spelled Diel) was born in 1779 and died in 1851. Your violin may be one of his, or it may be a copy, made in a German workshop at the turn of the 20th century. The only way to know with certainty which it is, is to have the violin examined in person by a qualified expert. If you can tell me the nearest large city to you, I can recommend experts for you.

A reproduction will ordinarily have a retail (replacement or insurance) value of approximately $1,000. A genuine Diehl, depending on condition and tone, can have a value anywhere from $5,000 to $25,000.

It seems that there is not one violin appraiser in Detroit. Is there another large city that is a reasonable distance from you?