Chemical damage. Even water can do such things, but it may be a household solvent. Cool reverse!!
📋 Item Submitted
Hello. Sorry about the picture quality. I've researched this online and in change but have not found anything. The "bubbles" appear only on the reverse and appear to be mainly beneath the relief.
Thank you for your time!
M
Marc's Expert Appraisal
ANA-Certified Numismatist · Hudson Valley Numismatics
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