Does the error carry a grade
See between R and T its an S ?
I think it's more funky damage and an active imagination.
try this link :http://www.error-ref.com/blisteredplating/
Your picture is showing what appears to be a gas bubble that is formed from the heat generated during the strike on a zinc coin. Your picture also shows "zinc corrosion"
hope this helps
Kennedys are my quest...
Talk about corrosion. Put that Lincoln out of it's misery. Peace Roy
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Thanks All. I guess I should put away this basket of cheer !
Chancre comes to mind.