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unknown planchet flaw

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  • silentnviolent
    • Mar 2015
    • 3
    #1

    unknown planchet flaw

    Hi, I am hoping that this anomaly can be explained.
    The weight is 2.39 which seems to be in line with the amount of wear, but the raised bubble on the reverse does not have a corresponding ding on the obverse. How does this happen if not a flawed planchet? Thanks for any help.
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  • diamond
    • Jul 2007
    • 2040
    #2
    The heavy state of wear precludes a secure determination. Both faces show defects. On the obverse you can see a low swelling behind Liberty's head. The fact that bulges appear on both faces in similar locations suggests that this is most likely heat damage. However, I can't rule out a bifacial die dent. Occluded gas bubbles are another possibility. You might test the coin's "ring" to see if the vibrations have been dampened by a hidden cavity or cavities.
    Mike Diamond. Error coin writer and researcher.

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    • silentnviolent
      • Mar 2015
      • 3
      #3
      I will test the ring compared with a similarly worn merc when I get home.

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      • silentnviolent
        • Mar 2015
        • 3
        #4
        In you article here http://www.coinworld.com/insights/vo...for-die-.html# on occluded gas bubbles, you mention application of pressure with a toothpick. Is this something one would want to do? Would rupturing the bubble negatively effect appeal?

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        • diamond
          • Jul 2007
          • 2040
          #5
          The metal overlying occluded gas bubbles on solid-alloy coins is usually too thick to depress with a toothpick.
          Mike Diamond. Error coin writer and researcher.

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