Discussion in 'Error Coins' started by Razz, Jun 21, 2021.

  1. Razz

    Razz Critical Thinker

    I won this off my LCS bid board and all it said was thin planchet and "unexplainable". It weighs 1.1 grams and is about the size of a US dime 18mm. DSCN2939~2.JPG DSCN2940~2.JPG DSCN2942~2.JPG

    Appears to be copper. Can someone 'splain this one? I was thinking maybe the US was minting foreign coins and a foreign planchet got into the mix?

    Edit: not magnetic
    Last edited: Jun 21, 2021
    sel w, DEA, Penny Luster and 2 others like this.
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  3. mrweaseluv

    mrweaseluv Supporter! Supporter

    I've seen copper coins "reduced" with acid with similar details retained as well as thin and light like this, but that 18mm dime size is hard to explain... admitedly the rim of the coin is gone/missing so either a smaller planchet was used to strike it or it was filed/ground off.. as only 1mm is missing that might possible be with the acid idea as well... indeed a very odd coin :D
    sel w, mynamespat, -jeffB and 4 others like this.
  4. fretboard

    fretboard Defender of Old Coinage!

    Yes, I think you're right. :D The US Mint was minting foreign coins in 1940 and the die was changed to a Lincoln cent but the planchet was still from a foreign coin. Now you gotta figure out which foreign coin planchet was left in the hopper?? Anyone know??
    sel w and Cheech9712 like this.
  5. paddyman98

    paddyman98 Let me burst your bubble! Supporter

    It's DEFEX - Definitely Explainable ;)

    That would be an Acid Dipped Copper Cent.
    Not struck on any foreign planchet. IMHO
    Last edited: Jun 21, 2021
  6. alurid

    alurid Well-Known Member

    I also think it was reduced in thickness and diameter by a soaking in an acidic solution.
  7. Conder101

    Conder101 Numismatist

    Correct the acid attacks the edge as well as the faces and reduces the diameter just like it reduces the thickness
  8. Kevin Mader

    Kevin Mader Fellow Coin Enthusiast

    Acid...I agree with our fellow enthusiasts.
    sel w and Stevearino like this.
  9. Collecting Nut

    Collecting Nut Borderline Hoarder

    Appears to have been dipped in acid at some point in the past.
    sel w likes this.
  10. kanga

    kanga 65 Year Collector Supporter

    Hard to tell from those images but I think the devices and lettering are too sharp for an acid coin.
    I think the explanation is something else, but what ...???
    sel w and Cheech9712 like this.
  11. Fred Weinberg

    Fred Weinberg Well-Known Member

    Acid/chemically treated
    --Nothing more, nothing less
  12. -jeffB

    -jeffB Greshams LEO Supporter

    Remember, on copper and nickel coins, acid can enhance detail. Metal that flows into the devices gets more work-hardening, and that makes it more resistant to etching.
  13. Penny Luster

    Penny Luster Supporter! Supporter

    The reason they did this is that these acid cents would work in 10 cent vending machines.
    ZoidMeister, Magnus87, alurid and 7 others like this.
  14. John Wright

    John Wright Well-Known Member

  15. Chris Winkler

    Chris Winkler Active Member

    Why would the coin be soaked in acid?
  16. Fred Weinberg

    Fred Weinberg Well-Known Member

    Don't understand your question Chris-

    There can be either no reason, or many
    reasons, but that has nothing to do with
    the fact that the coin IS acid treated.

    The why is unimportant - you'd be surprised
    what folks do to their coins (as we see each
    day on here)
    Spark1951 and Kentucky like this.
  17. Mountain Man

    Mountain Man Supporter! Supporter

    Shaved to use as a dime in a machine. Exposed to some type of acid after that. All PMD with no additional value.
  18. Kentucky

    Kentucky Supporter! Supporter

  19. Stevearino

    Stevearino Supporter! Supporter

    @Penny Luster, great answer. I'd never thought of that. Now, I have to start looking for ten cent vending machines!

    Penny Luster likes this.
  20. Razz

    Razz Critical Thinker

    Thanks all! I will get some comparison photos with a normal 1940 cent. Acid treated seems the favorite and is logical.
  21. potty dollar 1878

    potty dollar 1878 Well-Known Member

    Way before my time and excellent answer.
    Penny Luster and Cheech9712 like this.
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