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 Replies: 10 / Views: 1,061 |
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Pillar of the Community
United States
1915 Posts |
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Pillar of the Community
United States
2253 Posts |
I am guessing by the discoloration that it is zinc rot. Just a guess.
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Bedrock of the Community
United States
62064 Posts |
Looks like a plating bubble. Not the pimple under the mint mark. That is probably what is the cause of the air under the plating. It pretty much circles that area.
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Pillar of the Community
 United States
1915 Posts |
Yes, it does look like a plating bubble. The odd thing is that the are "inside" and left og the furthest left arrow is all completely flat as the field of the rest of the coin.
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Pillar of the Community
United States
1915 Posts |
Here is what is raised. Everything else is flush.  Edited by seal006
02/10/2016 1:29 pm
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Bedrock of the Community
United States
62064 Posts |
It will probably get worse with it exposed with air.
You might leave it out on a shelf for a time and see how it progresses?
Keep this image and check back in a year to see if it has progressed with another image.
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Valued Member
United States
334 Posts |
Strange coin seal. I would try some tracing paper and pencil and rub lightly over it. Maybe expose something the eye or camera don't see.
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Bedrock of the Community
United States
17884 Posts |
Looks like an early stage of zinc rot.
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Rest in Peace
United States
17900 Posts |
Unfortunately I have to agree that it appears to be a plating separation issue.
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Valued Member
United States
261 Posts |
In the second image, the arc of the raised area in question appears to be a match to the mintmark arc. Very curious how that could happen.
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Bedrock of the Community
United States
62064 Posts |
When air gets under the plating or the split, then the zinc starts to alter. Sometimes it raises, then falls and eventually during circulation the foil falls off the coin. Leaving a crater where the zinc rots away.  On the OPs coin, the raised area may have been pin hole, that let air into the zinc layer. Now appearing to have raised, but the air has started to breakdown in an almost circular direction from that point. |
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Posted 02/10/2016 1:21 pm
