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Strange metal bumps on a 1991-D Lincoln Cent.

 
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New Member
United States
34 Posts
 Posted 06/29/2018  1:22 pm Show Profile   Bookmark this topic Add SawtoothJack to your friends list Get a Link to this Message
Found this strange 1991 US cent with these weird bumps all over it in a roll search (finally found that presentable 2017-P for my album by the way). Tried to get good closeups of the raised metal lumps. What you're seeing in the photos is a 20x to 40x zoom of the field on the obverse. Looks kinda like ole' Abe is sneezing. #129315; I'm leaning towards PMD, maybe from heat or chemicals, but it could be a mint error. As we all know, Quality control has certainly let bigger goofs slip by in the past.
Opinions?

Bedrock of the Community
United States
15719 Posts
 Posted 06/29/2018  1:41 pm  Show Profile   Bookmark this reply Add moxking to your friends list Get a Link to this Reply
Zinc rot. Copper plating is detaching from interior zinc.
New Member
United States
34 Posts
 Posted 06/29/2018  1:48 pm  Show Profile   Bookmark this reply Add SawtoothJack to your friends list Get a Link to this Reply
Makes sense. One spot on the reverse actually looks like a volcano.
New Member
United States
34 Posts
 Posted 06/29/2018  1:49 pm  Show Profile   Bookmark this reply Add SawtoothJack to your friends list Get a Link to this Reply
Thanks for your help. I'd never even heard of zinc rot before.
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United States
9134 Posts
 Posted 06/29/2018  2:17 pm  Show Profile   Bookmark this reply Add Spence to your friends list Get a Link to this Reply

Quote:
I'd never even heard of zinc rot before.


If you hang out in this part of CCF for very long, you'll see that it comes up quite frequently. It is a great learning experience!
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
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Canada
6133 Posts
 Posted 06/29/2018  2:25 pm  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
Pillar of the Community
United States
1637 Posts
 Posted 06/29/2018  3:17 pm  Show Profile   Bookmark this reply Add nfine to your friends list Get a Link to this Reply
I have to ask, how can you tell anything from those images?
Remember, what the Dormouse said.
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United States
15719 Posts
 Posted 06/29/2018  4:23 pm  Show Profile   Bookmark this reply Add moxking to your friends list Get a Link to this Reply
Bubbly surface + date = zinc rot. Photo is good enough to see that.
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United States
30305 Posts
 Posted 06/29/2018  4:31 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
At first I thought it was something from the Mars Rover, but now it makes sense.
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United States
7011 Posts
 Posted 06/29/2018  6:05 pm  Show Profile   Bookmark this reply Add Mark1959 to your friends list Get a Link to this Reply
That's just a close up of lizard skin!


Completed the Dansco 8166 Album
(1964-2011) Kennedy half w/Proofs on Dec 3rd.

Now working on the Dansco 8167 Album
(2012-Date) Kennedy half w/Proofs.
27pcs, of 28, so far

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United States
15336 Posts
 Posted 06/30/2018  5:41 pm  Show Profile   Bookmark this reply Add BadThad to your friends list Get a Link to this Reply
Plating bubbles, normal:


Lincoln Cent Lover!
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United States
14112 Posts
 Posted 07/11/2018  03:31 am  Show Profile   Check Errers and Varietys's eBay Listings Bookmark this reply Add Errers and Varietys to your friends list Get a Link to this Reply
These are called Plating Bubbles. It's very common on Copper plated Zinc planchets. http://www.error-ref.com/blisteredplating/
Errers and Varietys.
More information about Die Deterioration? http://goccf.com/t/317950
Retired U.S. Mint Coin Die Set information. http://goccf.com/t/302961
1988 P LMC RDV-006, 1998 P LMC Wide AM, and 2000 P LMC Wide AM. http://goccf.com/t/327834 http://goccf.com/t/294303 http://goccf.com/t/312900
1973 D Lincoln Memorial cent With Recurring Die Subsidence Error Information. http://goccf.com/t/304624
Machine Doubling tutorial. http://goccf.com/t/332421
Die states progression on coins. Scroll down, so you can see the different die state progressions. http://goccf.com/t/325638
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United States
17192 Posts
 Posted 07/11/2018  08:16 am  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
Similar bubbles found on many pennies from the 80's to 90's. Mint was still learning how to plate coins I guess.
just carl
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United States
7414 Posts
 Posted 07/11/2018  09:20 am  Show Profile   Bookmark this reply Add SilverDollar2017 to your friends list Get a Link to this Reply
It's just some plating bubbles. Doesn't increase the value of the coin.
Collector of all classic US coinage.

How to identify cleaned coins: http://goccf.com/t/319679
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United States
1543 Posts
 Posted 07/12/2018  3:44 pm  Show Profile   Bookmark this reply Add Kurrency Ken to your friends list Get a Link to this Reply
Zincoln zits!

KK
New Member
United States
34 Posts
 Posted 07/17/2018  07:58 am  Show Profile   Bookmark this reply Add SawtoothJack to your friends list Get a Link to this Reply
More like Lincoln snots. Looks just like he just let loose a nose shower, and probably had to clean the first beard afterwards.
(I also have one that looks like Lincoln has a Mohawk)
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