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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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1989 Penny DDR

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  • rayb1234
    Member CONECA
    • Oct 2025
    • 55
    #1

    1989 Penny DDR

    I have this 1989 penny that looks to have doubled die on reverse. I am still trying to figure the difference between Doubled die and Machine doubling. Am I seeing DDR on this penny? Thanks
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    Tags: doubled, doubled die
  • MintErrors
    Minterrors.org
    • Jun 2015
    • 3905
    #2
    In my opinion, I believe it is not a doubled die. If it was, it might be too minor. There is no additional thickness, or split serifs nor any tpe of cookie cutter line where one impression was placed on top of another. For doubled dies each impression is typicall at the same height. Machine damage usually shows step like, making the letters look clipped or damaged.

    Its best to use the documented websites that tailor to doubled dies. Those working dies that had doubling on the working dies (prior to 1996) were sunk into metal. Typically - if a coin is not listed as described on the documented websites, its something other than a doubled die.

    The websites should show areas where doubling should be apparent. Its important to read the description as this typically lists the areas with doubling.

    Home - CONECA Master List
    Https://conecaonline.info
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    Variety Vista Home
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    Wexler's Coins and Die Varieties
    Https://doubleddie.com
    Die varieties such as doubled dies, Repunched mint marks (RPMs), Over Mint Marks (OMMs), Repunched Dates, Overdates, coin design varieties, as well as regular coins and error coins.

    A Comprehensive Web Encyclopedia of U.S. Copper Coinage
    Https://coppercoins.com


    I have a few educational posts on my website as well.
    Last edited by MintErrors; 10-17-2025, 09:09 AM.
    My signature block :

    Three helpful posts:
    How to take better photos with a Cellphone:
    https://board.conecaonline.org/forum...th-a-cellphone

    RPM or DDO question? Help us help YOU:
    https://board.conecaonline.org/forum...lp-us-help-you

    What Forum to post your coin questions:
    https://board.conecaonline.org/forum...t-forum-to-use

    Gary Kozera
    Website: https://MintErrors.org

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