I think that Marc and Edward have already given you all the necessary info, what can I say, Just try to preserve what you have, its value in bucks is not the main thing, what counts is the historical witness of your gun.
Anyway, a good cleaning with nothing abrasive would do wonders. I've been using gun oils like DW40 and Ballistol for ages without any problem.
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"Originality can't be restored and should be at the top of any collector's priority list.
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