9423Re: Unusual upset on a nickel planchet
- Sep 1, 2005Although the coin weighs 4.88 grams, the planchet appears to be quite
a bit smaller than a normal nickel planchet. This might be more an
illusion than anything else since its diameter is a respectable 20.70
millimeters. However, this value is probably greater than the
original diameter due to the effect of the off-center strike. I need
to measure some more normal nickel planchets to establish the range
--- In firstname.lastname@example.org, "Mike Diamond"
> I have the off-center nickel, and the planchet is even more unusualencountered
> than I anticipated. It shows a type of upset I've never
> before -- if it is, in fact, upset.it
> The edge is neither trapezoidal in cross-sectional profile nor is
> flat. It is convex and rounded in cross-sectional profile. Theseen,
> proto-rim is very high and is flat on top. Just inside the proto-
> rim, one can see an area of metal that's been carried in from the
> edge and flattened down to form a crenulated border. The rounded
> edge and relocated metal reminds me of some altered coins I've
> but this defintely took place prior to the strike.on
> The planchet itself has a buff gray color and slightly matte
> microscopic texture which is unlike a typical nickel planchet. The
> weight is within the normal range of variation for nickels (4.9 g
> my quickie scale).normal
> Perhaps these odd planchets are being rolled through a device other
> than an upset mill, perhaps after normal upset or in place of
> upset. It could be intentional or accidental.The
> I'm stumped (what else is new?), but this makes great fodder for my
> upcoming article.
> --- In email@example.com, "Mike Diamond"
> <mdia1@a...> wrote:
> > Once in a great while I come across a nickel planchet or an off-
> > nickel in which the proto-rim is very high and very distinct.
> > center coin in this auction listing is one such beast:different
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=8328082283
> > In some cases it's due to unusually strong upset caused by a
> > closer-than-normal positioning of the inner drum and outer half-
> ring of
> > the upset mill. In other cases it looks like an entirely
> > upset mill was used. The latter planchets show a high, squared-off
> > proto-rim in vertical cross section, and a flat vertical edge.years
> > peculiar. I also have an off-center cent (unplated!) with this
> > strange proto-rim. I got the latter from Fred Weinberg a few
> > ago. I'm not sure which subcategory this newest acquisitionErrorscope.
> belongs to
> > yet. Once I see it, I'll know.
> > I'm currently writing up my findings for an article in
> > any of you have peculiar planchets or off-center coins of this
> > PLEASE share them with me. You will be fully credited.
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