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CONECA (pronounced: CŌ´NECA) is a national numismatic organization devoted to the education of error and variety coin collectors. CONECA focuses on many error and variety specialties, including doubled dies, Repunched mintmarks, multiple errors, clips, double strikes, off-metals and off-centers—just to name a few. In addition to its website, CONECA publishes an educational journal, The Errorscope, which is printed and mailed to members bimonthly. CONECA offers a lending library, examination, listing and attribution services; it holds annual meetings at major conventions (referred to as Errorama) around the country.

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1988 D penny with bubbles

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  • #1

    1988 D penny with bubbles

    Found this coin in bank roll can anyone tell me what caused all these bubbles
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  • #2
    Plating blisters.

    Definition: This error type occurs only on copper-plated zinc cents from 1982 to the present. Blisters form during the strike when expanding gas pushes up the copper plating from heat and pressure. A weak bond between the copper plating and the zinc core is a necessary prerequisite as are contaminants within or under the plating.

    https://board.conecaonline.org/forum...y-with-bubbles
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    • #3
      One of the main reasons I do not collect zinc cents.
      Gary Kozera
      Website: https://MintErrors.org
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      • #4
        Originally posted by MintErrors View Post
        One of the main reasons I do not collect zinc cents.
        Agree
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