1990D LMC - incomplete/mishap plating or env dmg?

Discussion in 'Error Coins' started by CygnusCC, Jun 5, 2021.

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  1. CygnusCC

    CygnusCC Roping the Learns

    This is a weird one. With all the black gunk on it I just figured that there was some reaction that dissolved the copper plating, but then I saw that the gunk was still on the copper too, and that still seems somewhat intact.

    I searched and found an incomplete plating error on error-ref and was wondering if something may have gone wrong with the plating bath...
    http://www.error-ref.com/incomplete_plating/

    I'm still leaning towards some sort of environmental damage, though. There's spots on the memorial that still have bits of copper on it which seems to imply the copper was rubbed off.

    Thoughts on this?

    1990D_plating_obverse.png
    1990D_plating_reverse.png
    1990D_plating_worn1.png
    1990D_plating_worn2.png
     
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  3. potty dollar 1878

    potty dollar 1878 Well-Known Member

    Its a zilincon after all!!!!:wacky::wacky:,the plating was exposed and its starting to show its inner zinc.
     
    CygnusCC likes this.
  4. CygnusCC

    CygnusCC Roping the Learns

    Hah, probably right. I'm just curious what wore the plating off. I think it happened prior to the black gunk (grease?) since the gunk is on both the copper and on the zinc.

    Maybe someone took a buffing tool to it or something.
     
    Last edited: Jun 5, 2021
  5. Pickin and Grinin

    Pickin and Grinin Well-Known Member

    This looks like the plating was removed then the coin corroded.
     
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