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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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1927 Lincoln Cent Doubling?

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  • #1

    1927 Lincoln Cent Doubling?

    1927 Lincoln Cent Doubling?
    I believe I have Machine Doubling understood.
    I would like to know why so many odd places doubling are seen on this coin.

    (1) Triple doubling on bridge of nose.
    (2) Doubling on eyelid.
    (3) Doubling on collar and coat near neck.
    (4) Big indent along outside of ear
    (5) Doubling of date.
    (6) Some doubling of the inside of the left wheat.

    Your sharing of knowledge would be appreciated. Ed

    Sorry about the pictures – need to bone up on photography.
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  • #2
    More pictures

    2 more pictures. Ed
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    • #3
      It is machine doubling on both the obverse and reverse. At times more than one shelf of machine doubling can be seen. This is due to the vibrating coin striking the die.

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

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      • #4
        BJ: after rereading Error Variety. Com article on machine doubling I realized MD can random or mimic any place on the coin. What I didn’t know was the coin vibrates. I thank you for this new insight. Ed

        MD Push Type is extremely common and has hypothetically been suggested as a product of a loose hammer or anvil die, where after the strike with some of the original energy of the strike transferred, there is a rebound and a shift that sends the die back down, typically in a slightly altered position where it subsequently hits the design on the coin and pushes it down. The result is a flat, shelf like area of the design that appears to differing degrees, as being doubled.
        MD can impact as little as one letter or whole parts of the coin. It can be random or mimic classes of Doubled Dies in appearance. If the mintmark is doubled similarly to the date, odds are very high it is MD.

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