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9463Re: [Error Coin Information Exchange] Re: Unusual upset on a nickel planchet

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  • bull102797@YAHOO.COM
    Sep 7, 2005
      No clue at all, it is just strange.

      --- Mike Diamond <mdia1@...> wrote:

      > One thing I'd like to understand about planchets
      > such as the one you
      > pulled out is exactly how such a wide, high
      > proto-rim is produced. It
      > would seem that more than simple squeezing and
      > rolling is involved. It
      > looks almost as if the two faces are clamped between
      > two flat cylinders
      > as a slightly wider perimeter is squeezed and
      > rolled. Otherwise, does
      > one explain the abrupt junction between inner border
      > of the proto-rim
      > and the flat surface?
      > Does anyone out there have a clue?

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