My discussion thread from September 5th was already archived, but I thought it might be useful to say what was wrong with the violin.
Our luthier solved the problem with the buzz in the violin sound.
First, the fingerboard was glued in place, but, surprisingly, still you could hear some buzz... Then the violin was checked for any open seams.
It turned out that there was an open seam extremely hard to detect from the exterior of the violin, even if carefully inspected, taped, etc.
When the luthier looked inside through the pin hole he saw that light was coming in from one spot.
After fixing that open seam the good sound came back entirely.
Thank you very much for all the opinions and suggestions! We were at the point where we did not believe that this violin could be restored. This summer, we took the violin to some great luthiers with no result.
(The problem with this buzz first appeared after major work was done on the fingerboard - it seems that the fingerboard came unglued and a seam opened when that work was done.)
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