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Re: high pressure strikes

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  • tumbleweed
    That s what I was looking at on ebay, graded NGC coins with that description. Thanks.
    Message 1 of 5 , Oct 10, 2009
      That's what I was looking at on ebay, graded NGC coins with that description.
      Thanks.
      --- In errorcoininformationexchange@yahoogroups.com, "Michael" <mdia1@...> wrote:
      >
      > Actually, a large broadstrike can be the result of abormally high ram pressure (the pre-set tonnage applied to a normal planchet) or an abnormally small minimum die clearance (with normal ram pressure). So a large broadstrike is not a particularly good indicator of abnormally high striking pressure. Neither is a partial collar with a very expanded horizontal flange.
      >
      > A finned rim on a coin struck in-collar is a better indicator of abnormally great ram pressure because the die clearance is irrelevant when it comes to the presence or the height of the fin.
      >
      > I notice that NGC is beginning to slab coins as "high pressure strikes". I haven't seen these up close, but I suspect that's how they're labeling finned rims now.
      >
      > --- In errorcoininformationexchange@yahoogroups.com, "tumbleweed" <goldpans@> wrote:
      > >
      > >
      > > A very large broadstrike?
      > > Say for instance a cent was a high pressure strike outside of the collar, would it be an approximately bigger/spread than a nickle or bigger?
      > > How can one be certain that it's not just a broadstrike?
      > >
      > > --- In errorcoininformationexchange@yahoogroups.com, "Michael" <mdia1@> wrote:
      > > >
      > > > If the coin is struck in-collar, it has a finned rim. If struck with a partial collar, the face struck by the hammer die will be considerably expanded. If struck outside the collar it will assume the appearance of a very large broadstrike.
      > > >
      > > > --- In errorcoininformationexchange@yahoogroups.com, "tumbleweed" <goldpans@> wrote:
      > > > >
      > > > > How does one tell if a coin is an excess pressure strike?
      > > > >
      > > >
      > >
      >
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