During the majority of Fox production the Sterlingworths, A grades and B grades were finished in sprayed lacquer. Lacquer chips easily and crazes with time. Most have had some type of finish restoration either top coated or fully redone. Finding a other than very high condition Sterlingworth with original finish is very rare.
The only solvent for a dried oil finish is a long soak in Acetone from my experience. Alcohol will remove shellac easily, lacquer thinner will remove lacquer.
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