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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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1969s MD not DD & 67,72,73,79

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  • kshuma
    • Feb 2011
    • 24

    1969s MD not DD & 67,72,73,79

    HI Guys

    Okay this is what I have learned in the past few days.. I hope. These coins I had found in the past and was saving...... images below. I had thought by the information I had found previously (web, books, etc.) that these were actual DD's (hub doubling) and RPM (re-punched mint marks).

    Now I am fairly confident that they are only (MD) machine doubled dies. "flat shelf like apperance no solid seperation lines on serifs"

    If it were not for a suggestion from clair and james to post the 2010 proof on this forum I would still be misdirected to what I have due to lack of information.

    Jason what you provided "a common coin with MD could in fact be a in collar double struck coin could prove nightmarish if the wrong person is holding the coin and prone to over analysis" is absolutely true. With the dust speck of knowledge I have on the subject, I could have easily misled my family and friends.

    19Lyds it was your genuine curiosity and images that really made the whole discussion come to light for me. If you had not sparked an in depth conversion on my post I feel I would still be in the shadows trying to understand what and why.

    I guess one line suggestions are okay if the individual asking for advise is only out for monetary gain. But for many of us, we just want to understand more thoroughly on what we are collecting so we too can pass on the correct information for generations to come.

    Again thank you all very much for your insightful knowledge.
    Ken
    Attached Files
  • jcuve
    Lead attributer
    • Apr 2008
    • 1497

    #2
    Ken: yes, all these examples display machine doubling. I would note the proper term is Machine Doubling (not machine doubled dies as the die is not doubled) - it is sometimes called mechanical doubling (Wexler likes this term) and strike doubling. It has other names but I don't want to go crazy.

    I am including an illustration I made a few years ago showing 1983 DDR-001 and 002 (left column) next to three cases of machine doubling also found on 1983 reverses (right column). The illustrations include faux overlays of paper to show the shape of the doubled areas.

    Jason Cuvelier

    CONECA
    Lead attributer

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    • kshuma
      • Feb 2011
      • 24

      #3
      Hi Jason

      Thank you for the confirmation on these and the correct general terminology to use. Your explanation and images are very easy to grasp and crystal clear to me. I would expect others will have a better understanding on the subject at hand "MD vs DD". Thank you.

      On another note, I have a 1960 D cent that is a bit confusing to me. I will post tonight or tomorrow, and would like a few expert opinions.

      Ken

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      • coin-crazy
        • Aug 2010
        • 528

        #4
        I see machine doubling is on the rise again. Its hard at first but after awhile it gets easier.Thank you for sharing thou,it sure helps the next person,and Jason great help and nice pictures!!
        Still the best "Nickel Trail Die Hunter". 2013 ((MIKEE)) T.Davis

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