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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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1957-D possible DDO

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  • #1

    1957-D possible DDO

    New member, thankful for the opportunity to be a part of the group. Can't say I'm new to collecting but definitely hitting my stride now. Inquiring about this 1957-D found during a box hunt. Date appears to be hit twice. Your professional opinion is greatly appreciated.
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  • #2
    In my opinion, this looks like machine (worthless) doubling, where one level is lower than the other. IF they were at the same height it would be a different story.
    Worthless doubling is lower, shelf or step like and may damage the letters and numbers by sheering off some of it. In addition, the numbers or letters at the HIGHEST area may be thinner.

    A doubled dies are created when the mint workers added additional impressions on steel working dies and they were slightly off axis on each impression. This may make the letters and numbers thicker, and they may also show enough separation to see a cookie cutter line where one impression was placed on top of another. There may be notching or split serifs as well.

    The "9" in the date has some extra material in it, it could be a die crack forming or just a clogged area. The 1957-D did have quite a DDO's and most were concentrated on LIBERTY. You can see them at varietyvista:

    http://varietyvista.com/01a%20LC%20D...O%201957-D.htm
    Last edited by MintErrors; 02-05-2024, 12:10 AM.
    Gary Kozera
    Website: https://MintErrors.org

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