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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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Sacagawea Dollar

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  • IN_SEARCH_OF
    • Sep 2008
    • 22
    #1

    Sacagawea Dollar

    While looking over my new 2008 s Proof set I noticed some doubling on the Sacagawea Dollar. It appears on most of the USoA Letters, eagles tail feathers and a few other aspects of the rev. I compared it to the Mint set and these aspects do not appear on the Mint Set Sacagawea Dollar.
    Any Help/advice with this would be appreciated. I apologize for the poor pics as between the case and shinny surface of the coin it is very difficult to see clearly. The arrows point to area of the doubling.
    Thank you in advance
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  • diamond
    • Jul 2007
    • 2040
    #2
    Since the doubling is in more than one direction, it's not a doubled die. It could simply be a side-effect of the fact that proofs are struck more than once. Any instability in the die or coin can produce microscopic doubling. Another possibility is machine doubling, which is also produced by instability in the coinage press.
    Mike Diamond. Error coin writer and researcher.

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