C a wunderlich violin dating
The term bourse is derived from the 13th-century inn named "Huis ter Beurze" (center) in Bruges.From Dutch-speaking cities of the Low Countries, the term 'beurs' spread to other European states where it was corrupted into 'bourse', 'borsa', 'bolsa', 'börse', etc.
many of the models are in my opinion absolutely awful, while many models from companies such as Eastman, Gliga, and Hoffman can be decent or even very nice.
Some of these are pseudonyms that were used by makers for their own hand made instruments and they are still hand made by a specific maker.
I have no idea why someone would not use their real name but that was their choice and I include them here for reference.
It has been estimated that over 5 million of these "trade instruments" were made during this time period.
The only way to know the value of your instrument is to have it seen in person at a violin shop or an appraiser associated with a musical instrument auction house.