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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.

CONECA was formed through a merger of CONE and NECA in early 1983. To learn more about the fascinating HISTORY OF THE ERROR HOBBY and THE HISTORY OF CONECA, we encourage you to visit us our main site Here

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1971 D

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  • 1971 D

    IMG_20210131_152825296.jpg IMG_20210131_152947029.jpg

  • #2
    This could be either a rolled thick planchet or maybe a improper alloy mix - though there is no discoloration or anything to support the alloy diagnosis. I am not sure 3.27 is really enough over the norm or it to really be worth much...
    Jason Cuvelier

    CONECA
    Lead attributer

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    • #3
      your knowledge + my findings , maybe we can be partners

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