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1971-P Kennedy 50c Error- Lamination?

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 Posted 06/05/2023  4:06 pm Show Profile   Bookmark this topic Add mb560600 to your friends list Get a Link to this Message
This Kennedy half came from a bank roll I withdrew. At first I thought the brown spot was a stain, but upon further examination I discovered it is the exposed copper layer of this clad coin.
The weight of the coin is 11.20 grams, so it is slightly under weight. Research would lead me to conclude it is a lamination, possibly due to a poorly rolled or mixed clad planchet. I would appreciate any further suggestions as to what kind of error this may be.
Thanks for taking a look.






Mark E Bergeson
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 Posted 06/05/2023  5:07 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
Looks like some sort of foreign substance.
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 Posted 06/05/2023  5:21 pm  Show Profile   Bookmark this reply Add nick10 to your friends list Get a Link to this Reply
some sort of glue maybe, an acetone soak is the next step to see if the spot comes off
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 Posted 06/05/2023  6:32 pm  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Thanks for the responses. I'm still inclined to believe that this is a lamination of the nickel clad layer. I did soak the coin in purified water and there was no indication that this was a stain. However, I will give the coin an acetone soak and then take some additional photos.
Mark E Bergeson
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 Posted 06/05/2023  10:18 pm  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
The coin was soaked for an hour in pure acetone. I gently swabbed the area in question with a Q-Tip, and nothing came off of the copper colored area. There is nothing sticky or slick in that area.
Here are some photos of the coin after the acetone soak.









The copper colored area appears to be below the level of the surrounding nickel, not above it. That would seem to be indicative of a lamination.
Thanks for your comments.
Mark E Bergeson
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 Posted 06/06/2023  12:47 am  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Dearborn, if you look closely at the 2nd and 3rd photos of the original post, you can see that these were taken at an angle of the coin. Both display the difference in surface levels between the copper colored area (lower) than the adjacent nickel layer (higher). It's obviously a small difference, but it is discernible.
Mark E Bergeson
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 Posted 06/06/2023  9:32 pm  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Any further help on this coin?
I am inclined to categorize this as a mint error, specifically, a clad layer defect or lamination. If anyone has further guidance, I would certainly appreciate the help.
Thanks!
Mark E Bergeson
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 Posted 06/07/2023  01:51 am  Show Profile   Bookmark this reply Add Brandmeister to your friends list Get a Link to this Reply
There seem to be other lamination discussions on this forum in the past, including this one. Seems to bear some similarities to your coin.

http://goccf.com/t/54730
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 Posted 06/07/2023  08:26 am  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Thanks for the response Brandmeister. However, this coin appears to have a portion of the nickel clad layer missing leaving an area of only copper. It is not a stain or foreign substance on the surface of the coin.
Mark E Bergeson
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 Posted 06/07/2023  5:52 pm  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
The form it is, this it is not what you guys say Lamination (so wrong denomination).

This coin if incuse appear to be a peeled clad. If rise it is foreign material.
Never argue with an idiot. First they will drag you down to their level. Then, they will beat you with experience. (MARK TWAIN)
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 Posted 06/07/2023  11:21 pm  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Thanks for your response, Silviosi.
The copper colored area is incuse; it is not a foreign substance.
What is a "peeled clad?" If the nickel area on the coin had "peeled" away, I would take the position that this is a lamination, which is a mint error.
Mark E Bergeson
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 Posted 06/08/2023  01:43 am  Show Profile   Bookmark this reply Add silviosi to your friends list Get a Link to this Reply
@ mb560600

Quote:
What is a "peeled clad?" If the nickel area on the coin had "peeled" away, I would take the position that this is a lamination, which is a mint error.


1. MINT ERROR= human was involved in the mechanical processes and result of an error. By definition of an error.
2. If during the cladding = lamination (union of two different material by different procedures, here rolling) of the clad over the core a missing part of the clad nickel miss, will never have round shape. point three explain.
3. the cooper and the nickel are almost square on molecular structure. In fact the both are dual pyramidal. One is tetra and other is octa. So never can broke round.

So those explanations show you is not mint error, because no human was involve and the molecular structure do not follow the natural course,

Your coin has foreign material. I can see this. Under the apparently cupric color you can see the Ni.

Mint errors are very rare. This term is use more and more in the foolish marketing sites.
Never argue with an idiot. First they will drag you down to their level. Then, they will beat you with experience. (MARK TWAIN)
Edited by silviosi
06/08/2023 01:46 am
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 Posted 06/08/2023  9:01 pm  Show Profile   Bookmark this reply Add mb560600 to your friends list Get a Link to this Reply
Thanks for weighing in, Silviosi.
However, if the area in question is incuse--meaning lower than the surface level of the nickel layer--how can this be the result of a foreign substance?
I'm going to show the coin to some of my fellow Metropolitan Coin Club members in Atlanta and see if they will confirm your opinion.
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