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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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Other forms of doubling:

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  • Other forms of doubling:

    Other forms of doubling:

    There are many reasons a coin can exhibit doubling.

    Die wear, aka die deterioration doubling:

    Dies can manifest an off set (shadow like) doubling that can appear raised or incuse depending on the composition of the coins struck. Typically the off set will be strongest along the periphery of the devices and head toward the rims. There may be the manifestation of heavy die flow lines.

    A 2007P clad dime:

    IMG_5917.JPG IMG_5914.JPG
    Jefferson nickel showing centralized and periphery die wear:

    IMG_4563.JPG IMG_4562.JPG
    On a 1989D Lincoln cent where the plating is also impacted:

    IMG_4020.JPG IMG_4021.JPG
    On a 1953 Lincoln cent:

    IMG_4615.JPG IMG_4616.JPG
    Jason Cuvelier

    CONECA
    Lead attributer

  • #2
    Die wear continued:

    Jefferson nickel along the outside of Monticello:

    IMG_4630.JPG IMG_4631.JPG
    1937 Lincoln cent and just the 7 has die wear:

    IMG_4599.JPG
    The periphery of a wheat cent:
    IMG_4598.JPG

    And it is rampant on the 1943 steel cents:

    IMG_5358.JPG IMG_5357.JPG

    Jason Cuvelier

    CONECA
    Lead attributer

    Comment


    • #3
      Die wear:
      this one is the type referred to a a poor mans doubled die (PMDD)

      1955 DDD_b.jpg
      Last edited by jcuve; 04-25-2021, 01:53 AM.
      Jason Cuvelier

      CONECA
      Lead attributer

      Comment


      • #4
        Post mint damage:

        While not common, post mint damage, often just a localized hit, can mimic doubling:

        The T from LIBERTY took a hit that looks like a notch, but is not.
        Compare to 2009 1c FY DDO-001

        PMD (doubling)b.jpg

        Or here where the ear took a hit:

        IMG_4581.JPG
        Jason Cuvelier

        CONECA
        Lead attributer

        Comment

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