1990D LMC Machine Strike Doubling?

Discussion in 'Error Coins' started by the_girls, Oct 7, 2016.

  1. the_girls

    the_girls New Member

    I haven't seen one this pronounced. It is machine struck doubling yes?
    I have more pics but they are uploading so slow. Thought I'd see what you think.
    Nothing else on the coin looks machine struck.
    I'm still pretty new at this so I thought I'd get a second opinion.
    I also searched for a variety such as this one and could not find one, giving me another clue it's probably a spender.

    Smiles, Heather

    image.jpeg
     
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  3. the_girls

    the_girls New Member

    I guess what had me puzzled is mostly the chin/lip area... Looks more raised then a shelf. Same on the front of the bust. Definitely raised there too.
     
  4. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    All coins, today, are struck by a machine! Sometimes the doubling occurs during the hubbing process (true doubling). Strike doubling, machine doubling, mechanical doubling and even ejection doubling mean pretty much the same thing and are often used interchangeably. Die deterioration doubling is an entirely different animal.

    Chris
     
  5. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    This coin is one of the Zincoln's, and they have developed a set of post-mint problems all their own. I do not pay much attention to them, so hopefully, someone else will chime in.

    Chris
     
  6. Seattlite86

    Seattlite86 Outspoken Member

    A lot of the newer Lincoln Cents (post 1982) have issues with the metal composition that sometimes make a coin look doubled. I'm not really seeing any sort of die or machine doubling. I'm thinking those are plate blisters and don't think it's anything of interest. I'll see what others say.
     
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  7. the_girls

    the_girls New Member

    Another view. And Thank you all for the input!
    image.jpeg
     
  8. Pickin and Grinin

    Pickin and Grinin Well-Known Member

    I remember reading an article about this type of profile doubling.
    I am sure that it is a form of DDD. Die Deterioration Doubling
     
  9. cpm9ball

    cpm9ball CANNOT RE-MEMBER

    Heather, have you ever found yourself in a forest with your nose placed squarely against the trunk of a big tree? What else do you see in the forest? Nothing? Right? That is about what you see on a coin when you post a super close-up!

    Chris
     
  10. mikediamond

    mikediamond Coin Collector

    It's most likely a case of plating disturbance doubling. During the strike, tensile forces are concentrated at and near the edges of the design. This can cause the plating to lift up and away from the copper core. Plating disturbance doubling is closely related to split plating doubling -- it simply lacks the splitting of the copper plating.
     
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