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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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1989 D Lincoln Mem Cent

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  • #1

    1989 D Lincoln Mem Cent

    Hello,
    I received this coin in change today. It seems to have a lot issues,
    I'm just not sure what. Is this a common problem with this type coin?
    Please see photos.

    Thanks

    Patricia
    Attached Files
    My mind is made up, don't confuse me with the facts!
    Tags: cents, errors, field, lincoln, problems
  • #2
    Hi Patricia,
    Your coin is not typical, although it does show some of the problems encountered with a copper plating over a zinc core.

    The pock-mark appearance is caused by trapped gas between the two layers. While this is a fairly common problem, your coin seems to have an excess of this feature.

    Also, the copper plating has broken down in areas exposing the zinc core (silver colored metal). Over a period of time, the zinc will begin to oxidize, swell and then turn into a powdery white substance.

    In other words, this coins life will be foreshortened due to these defects.

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

    Comment

    • #3
      1989 D Lincoln Mem Cent

      Thanks for all the help. I'll put it back in circulation, may be someone
      collects these.

      Thanks.
      My mind is made up, don't confuse me with the facts!

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