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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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JFK 1776/1976 D, Half Dollar

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  • #1

    JFK 1776/1976 D, Half Dollar

    Attached are 4 pics of a JFK 1776-1976 D Half dollar. I have looked at Variety Vista and found no listings for any errors on this coin. Could you give me your thoughts/opinion on the Mint Mark pictured. RPM, Mechanical, Cud, any help appreciated.
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  • #2
    looks like mechanical doubling that is also on the profile.
    coinfacts.com - conecaonline.info - board.conecaonline.org/forum/numismatic-site-links - briansvarietycoins.com - coppercoins.com - cuds-on-coins.com - doubleddie.com - error-ref.com - franklinlover.yolasite.com - ikegroup.info -lincolncentresource.com - maddieclashes.com - money.org - ngccoin.com/price-guide/world - ngccoin.com/census - ngccoin.com/resources/counterfeit-detection - nnp.wustl.edu - pcgs.com/pop - pcgs.com/coinfacts - pcgs.com/photograde - varietyvista.com - vamworld.com
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    • #3
      The mintmark looks to have MDD...you can see it in other areas as well on the obverse.
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      • #4
        Originally posted by atrox001 View Post
        The mintmark looks to have MDD...you can see it in other areas as well on the obverse.
        You do know that MDD stands for Master die doubling, if I'm not mistaken. I see none of that on this coin.

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        • #5
          In my world...MDD stands for Machine Damage Doubling. MD stands for Master Die.
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          • #6
            You do know that MDD stands for Master die doubling, if I'm not mistaken. I see none of that on this coin

            In my world...MDD stands for Machine Damage Doubling. MD stands for Master Die.

            I understand the difference in opinions, I have seen it both ways on different board forums. I would say in this case, Coneca has made a pre determination of this acronym in their glossary of error- variety terms. This being: (Machine doubling damage (MDD)
            This NOT a form of hub doubling. The secondary image is flat and shelf-like, with rounded-out serifs. There are no valleys or furrows between the images. When tilted, the area between the two images is shiny. The light reflects off of sheared metal. Because the metal is actually sheared or moved, this form of doubling is considered damage to the coin and commands NO premium. This form of doubling is also referred to as “Strike Doubling” or “Mechanical Doubling” by others.”
            House rules always set precedence.
            Thanks

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