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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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Mint errors

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  • IUBB1
    • Jun 2021
    • 134
    #1

    Mint errors

    Can someone explain to me why so many coin mint marks are filled in or are blobs .
    Tags: None
  • mustbebob
    Moderator
    • Aug 2007
    • 3050
    #2
    There are numerous reasons. A couple are that continues striking has caused some die deterioration, and a chip forms inside the mint mark. Circulation damage may cause this, as well as purposeful die damage. Since mintmarks were hand punched up until 1990, incorrect punching by the mint technician may also be a reason. Some mint marks were punched so strongly that it lifted up some metal inside the mint marks. This is more prevalent with the S mint marks.
    Bob Piazza
    Lincoln Cent Attributer

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    • IUBB1
      • Jun 2021
      • 134
      #3
      Thank you for the info.

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