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I was given a Hopf violin for my birthday 4 years ago. Original Hopf violins were handmade and are the most valuable. Remakes were also made, but were produced in factories. In order to know if you own an original or not, you can look on the inside of the cooling for three hand notched crowns ( circles ) . It should also have square corner blocking on the inside. The square shape is important because since they weren't produced in factories, they had no tools to round them off.