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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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10.4g half dollars

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  • #1

    10.4g half dollars

    I have found multiple Kennedy Halves that weigh in at 10.4g-10.9g. Any information would be appreciated in regards to their weights and why their so outstanding.
    Thank you for your time and consideration.
    -Coinflipper
    Tags: None
  • #2
    Significantly underweight half dollars can be found in many years. 40% silver clad half dollars seem most often affected. The most prosaic explanation is that the planchets were punched out of stock that was rolled too thin.
    Mike Diamond. Error coin writer and researcher.

    Comment

    • #3
      I may have found a state quarter with this effect. I'm working on getting a more accurate scale. It is noticably thinner than it should be, yet all details are there (I first suspected acid dip) it looks like a bad planchet mix due to the grey marbling look it has. I have pictues somewhere. Do these have any value to collectors? I'm looking more into it in hopes it could be a foriegn planchet.
      Jimmy Ehrhart
      previous member of CONECA and C.F.C.C.

      Comment

      • #4
        Okay, it would help to know what date your quarter is and it is wise to obtain scales that weigh down to 100th of a gram.

        BJ Neff
        Member of: ANA, CCC, CONECA, Fly-in-club, FUN, NLG & T.E.V.E.C.

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        • #5
          So this is the coin. In the last picture of the edges, the coin mentioned is the one on the right. I am still working on getting a hold of a scale.
          Attached Files
          Jimmy Ehrhart
          previous member of CONECA and C.F.C.C.

          Comment

          • #6
            Your quarter was terribly abused. The edge appears thin because the rims were flattened after the coin entered circulation. Also, edge thickness is an extremely unreliable diagnostic, even in undamaged coins.
            Mike Diamond. Error coin writer and researcher.

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