What typical finishes were used on pianos?
What does her damage look like? White cloudy film? White spots?
Black spots?
Try rubbing an inconspicuous spot with lacquer thinner, to see if the
finish is lacquer.
Grand pianos can have a lacquer finish and/or rubbed oil finish.
Black lacquer was/is a long time favorite.... often a dozen or 2 or 3
of polished in coats.
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