Who knows (other than the manufacturer)?
Best bet is lacquer or oil. If the finish is hard and shiny it is probably
lacquer; if not, it *may* be oil. Lacquer thinner will tell you for
sure...if it melts the finish then it was lacquer.
A seal coat of shellac will allow virtually any finish of choice to be
applied over it.
Interesting timing for the question; there's an article in current FWW
on finishing oily woods in one of the shorter columns that's got good
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