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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.

CONECA was formed through a merger of CONE and NECA in early 1983. To learn more about the fascinating HISTORY OF THE ERROR HOBBY and THE HISTORY OF CONECA, we encourage you to visit us our main site Here

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  • #1

    What Material

    What Material did the U.S. Mint use to make the working dies from 1909 to the present? It does not matter the denomination. I am working on a project on deteriation. Thanks
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  • #2
    The Mint uses a carbon steel although I am not to sure which number it is. All the different steels (alloys) have a number system (like HY80 for submarine building) and you may be able to dig this information up on the net or, someone with prior knowledge may jump in here with more advanced information.

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

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    • #3
      Originally posted by wavysteps View Post
      The Mint uses a carbon steel although I am not to sure which number it is. All the different steels (alloys) have a number system (like HY80 for submarine building) and you may be able to dig this information up on the net or, someone with prior knowledge may jump in here with more advanced information.

      BJ Neff
      Thank you BJ. Carbon Steel is mainly a mild steel that is (in most cases) Carbourized which means the outside is the only part that is hard.(.015 to.020) I would think that the die itself would be made of a steel other than that, perhap's D-4 or similar. I am still up in the air about this.

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