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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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1960 Jefferson proof TDR?

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  • #1

    1960 Jefferson proof TDR?

    I can't seem to find any variations like this .... Or if it is even a TDR. I'm still having lighting issues also!
    Thanks for any help.
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  • #2
    What you have here is machine doubling, not a doubled die.
    Bob Piazza
    Lincoln Cent Attributer
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    • #3
      I agree with Bob, if it is step or shelf like, suspect machine/mechanical damage. Remember these are machines, hand tuned by humans. To error, is human, but machines are what they are and can change in an instant from near perfect to near mind boggling. It does not take much. They run faster than a jack hammer, slapping out billions of coins for circulation a year. Even the slightest vibration, or hiccup due to something gone wrong can create machine doubling like this.

      in this case, its a proof coin, but the conditions are the same even though the production rate is slower and a little less chaotic.
      Last edited by MintErrors; 09-13-2022, 01:30 AM.
      Gary Kozera
      Website: https://MintErrors.org
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