green coated 57 frankie in a PROOF set.

Is this weird or what? I just noticed that the obverse of this coin is turning green with what looks like pond scum. It is definitely on the coin and not on the cellophane envelope.

Edited to change the title from MINT to PROOF thanks to RUSS.

Edited to change the title from MINT to PROOF thanks to RUSS.
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Comments
<< <i>green coated 57 frankie in a mint set >>
Strange, that looks like a proof to me.
Probably a tiny hole somewhere and something leached in over the years. Or, could have been mishandling at the mint.
Russ, NCNE
"Senorita HepKitty"
"I want a real cool Kitty from Hepcat City, to stay in step with me" - Bill Carter
<< <i>hey, that one appears to have some cam.... I think frankie needs to be freed, then give him a bath..... >>
Yeah, kind of like this one:
Russ, NCNE
<< <i>hey, that one appears to have some cam.... I think frankie needs to be freed, then give him a bath..... >>
What kind of bath? Should I get some acetone and give him a quick dip? I have never dipped a coin before.
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"Senorita HepKitty"
"I want a real cool Kitty from Hepcat City, to stay in step with me" - Bill Carter
<< <i>Russel just loves the Cameo Frankies..... >>
I like any coin I can buy cheap and sell dear. That particular one is going to be a tidy profit.
Russ, NCNE
Merry Christmas Russie!!!!!!
"Senorita HepKitty"
"I want a real cool Kitty from Hepcat City, to stay in step with me" - Bill Carter
<< <i>What kind of bath? Should I get some acetone and give him a quick dip? I have never dipped a coin before. >>
I dunno if acetone would help you on that. Maybe, maybe not.
As BigE suggested, Jeweluster is probably just the thing. A quick dip and then a rinse in clean water. Leave the coin to dry on a folded paper towel, then flip it over so the other side can dry, too. If you must pat it dry with the paper towel to remove the water, OK, but don't rub it dry.