As a former numismatist I can offer you this most sound advice. DO NOT clean or polish them in any way thinking you'll get more if they look pretty. This will destroy value quicker then dropping them from 10,000 feet. If you are in possession of old American gold pieces or Silver dollars these will bring the most in value. Especially the rare mints such as Charlotte, New Orleans or Carson City.
I left the hobby because it left me, seeking investors rather then true hobbyists.
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