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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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1972-D 1C

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  • 1972-D 1C

    Hello this just may be my lack of understanding but I thought all business strike pennies have a rounded or beveled edge minted on them. But this one has a squared rim/edge all the way around this coin. Is this a normal or common on copper pennies? Any information will help my knowledge and be greatly appreciated
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  • #2
    By the way this coin weighted in at 3.09g


    • #3
      The coin's edge is made by a machine called an upset mill, and it does lift up and round over the edges. However, when a coin enters the coining chamber, it is held in place by a collar which keeps the metal from expanding while it is struck by the die. If the collar is relatively new, the coins edge may appear to be 'squared off'. It is just the collar and die in an earlier part of the striking process that makes it look like that. As the machines continually strike coins, the collar wears a bit, as does the die. These lead to a more rounded edge.
      However, Proof coins have significantly sharper edges. However, this is due to the specific steps taken to mint proof coins.

      Your coin just appears to be an earlier die state, well struck coin.
      Last edited by mustbebob; 09-12-2021, 12:01 PM. Reason: Fix typos
      Bob Piazza
      Lincoln Cent Attributer


      • #4
        Bob thank you the information . This is awesome and impressive explanation I greatly appreciate your help with this. I would have never figured that out.

        Thanks again.