I would like to have a little more information as to why your think it is copy made in Germany. I did a little research and understand that most of the copies are 4/4, and the first test is to measure. A real Del gesu would have a measurement of 13 and 7/8 inches, sometimes minus 1/16 inch. (This is from the Smithsonian website) It also would be in set-up as baroque.
If you have a reason that this violin is for sure a copy please explain.
This violin was in storage for over 100years and came from my great-grandfather that traveled extensively through Europe.
I would just like a little more info if possible.