9463Re: [Error Coin Information Exchange] Re: Unusual upset on a nickel planchet
- Sep 7, 2005No 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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