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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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Washington State Quarter

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  • Washington State Quarter

    Does this appear to anyone else to be struck through retained grease. In a mint set.

    Steven
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  • #2
    It looks to have been struck through a rubbery substance (something I've seen before). Whatever this substance is, it is so resilient that it doesn't take an impression. It's not grease.
    Mike Diamond. Error coin writer and researcher.

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