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 Replies: 20 / Views: 1,921 |
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Valued Member
United States
54 Posts |
I have a 1987 D penny with what clearly looks like a D under the D mintmark. Has anyone seen this before because I can't see this being PMD? Yes, I do plan on upgrading my USB microscope. *** Edited by Staff to Add Year to Title. Titles are Important! ***   |
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Moderator
 United States
34423 Posts |
@sav, you have a small break in the copper plating near the mintmark. This is allowing the underlying zinc to start oxidizing and expanding. This coin would be a spender for me.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Moderator
Australia
16837 Posts |
Sorry, but as noted by Spence above, this is PMD, caused by corrosion. When zinc bubbles "pop", they can leave behind a circular crater. When this happens right next to the "D" mintmark, it can make a semicircle that follows the outline of the "D", just like this. Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis
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Pillar of the Community
 United States
8767 Posts |
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Pillar of the Community
United States
5780 Posts |
Sorry but the top of the anomaly is to the south, it shouldn't be curving back and touching the MM where it is. PSDWords of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.
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Bedrock of the Community
United States
10038 Posts |
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Moderator
United States
56855 Posts |
Not an RPM. John1  |
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Bedrock of the Community
United States
10635 Posts |
From these photos, it appears to be a split plating issues. That would lead to the zinc blister which will lead to zinc rot. Spend it while you still can as there is no stopping it's destruction.  |
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Bedrock of the Community
United States
62064 Posts |
 Once the plating is split, the zinc is exposed and oxygen starts the zinc rot process. Spender. (The countdown has already started with this coin) So when buying a real RPM, watch out for the split plating that can also happen on RPMs.  The countdown is already started on the RPM with split plating. (So don't buy these when you see them for sale anywhere) 37 |
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Pillar of the Community
United States
7174 Posts |
 rot. |
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Bedrock of the Community
United States
19176 Posts |
The split plating rot pox. Love numismatics!
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Valued Member
 United States
54 Posts |
Wow, I was clearly wrong, lol. It's funny though, I ever thought I'd find a diseased penny. How long does it take for the "Rot" to completely break it down? Reason I ask, is it would be interesting to document the process.
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Bedrock of the Community
United States
10635 Posts |
Usually the rotting process doesn't take too long. Lots of. Zinc rot in various stages are easily found . The one thing for certain is once started, there is no stopping it. |
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Bedrock of the Community
United States
62064 Posts |
If acid touches the zinc it accelerates the rot process and the coin dissolves.
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Pillar of the Community
United States
7174 Posts |
I think that all zincolns that circulate will eventually rot to nothing.
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Moderator
United States
96674 Posts |
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Replies: 20 / Views: 1,921 |
Posted 10/26/2022 7:51 pm
