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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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1956 Proof Cents, Elliptical Planchets

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  • #1

    1956 Proof Cents, Elliptical Planchets

    I have 2 1956 proof cents which are too thick to fit in the Capital cases. One is 3.11 grams, the other 3.06. The rims on both start at the normal thickness on one side and increase to almost double the thickness on the opposite side. The heavier one is more pronounced. The metal builds up in an elliptical fashion. Strikes look normal on both surfaces.

    Does anyone have any knowledge of this? The closest I could come to an errror designation was "Rolled Thick Blank" but the uneven material is kind of unusual. Thanks!
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  • #2
    Your coins have "finned rims". Because of the increased striking pressure used to strike proofs, coin metal sometimes squeezes into the thin gap between die neck and collar. It's fairly common on proofs and adds little or no value to a coin.
    Mike Diamond. Error coin writer and researcher.

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