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

Zinc Rot Or RPM?

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Double Mint
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 Posted 04/16/2011  02:11 am Show Profile   Bookmark this topic Add Double Mint to your friends list Get a Link to this Message Number of Subscribers
Im not sure if this is zinc rot or RPM.

Zinc-Rot-Or-RPM?
coop
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 Posted 04/16/2011  03:02 am  Show Profile   Bookmark this reply Add coop to your friends list Get a Link to this Reply
If you are referring to the lower SE of the mint mark, that is zinc rot caused by the finning from the punching of the mint mark. The finning split the plating causing the zinc to get air and start the process of deteriation. After 1990 you don't see this any more just the 80's Zincolns.
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