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All Forums Category: US Coins and Currency Forums Forum: US Modern Variety and Error Coins

Odd Mint Mark, '91 D Penny

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durkastani
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 Posted 09/12/2015  4:10 pm Show Profile   Bookmark this topic Add durkastani to your friends list Get a Link to this Message Number of Subscribers
Not sure what I've got here.

Odd-Mint-Mark,-'91-D-Penny

Odd-Mint-Mark,-'91-D-Penny

Odd-Mint-Mark,-'91-D-Penny

Odd-Mint-Mark,-'91-D-Penny

Odd-Mint-Mark,-'91-D-Penny
mcanniz
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 Posted 09/12/2015  4:14 pm  Show Profile   Bookmark this reply Add mcanniz to your friends list Get a Link to this Reply
after 1989, they stopped hand punching the mint mark into the die, so it can't be an RPM, or repunched mintmark. it is called zinc rot. the copper plating somehow gets a hole in it, exposing the zinc. the zinc then reacts with the air and sort of rots away. it is very common on post 1982 zinc cents
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durkastani
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 Posted 09/12/2015  4:19 pm  Show Profile   Bookmark this reply Add durkastani to your friends list Get a Link to this Reply
I see. Makes sense, dissimilar metal corrosion is common.
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