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Manufacturers changed from shellac to lacquer around 1930-ish. You can test which you have by using a little solvent on a cloth in an inconspicuous area. Denatured alcohol will dissolve shellac. Lacquer thinner will dissolve lacquer. I'm betting this is shellac as the radio is old enough. To be authentic, you should use the original finish, and certainly not polyurethane, which is a modern invention and would lessen the value of the radio.
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Reece
Perfection is hard to reach with a screwdriver.
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