Re: Yellow 25c certified Sacagawea wash.
- That's a good point, I could make some extra cash
doing it on the side after my shift is over. It's
always good for practice anyways. We have a Bio-Rad 275
Microscope attached to an FTS175 FTIR. I need to reoutfit
the spectrometer to read from the microscope for the
microspectroscopy aspect. It's been collecting dust for a while and
this would be a good reason to put it back in
operation. I'll have to get back with you in a while once I
get some time to work on it and make sure I don't
screw something else up by working with it. The
Stingray is a good 100,000 and won't be purchased for a
while yet, but when the price comes down, I'll get to
try it out on different samples and I would think
coins aren't out of the running. I wonder if 5 bucks
per coin would be reasonable? 100 coins equals a nice
double denomination for me. :) The only problem is to
determine the actual composition, it would be a lot more
difficult. I'd have to do a mass spectrometric analysis
which is destructive and I have very limited access to
that equipment. The best I could really offer with the
microscope is determining if the composition is different
unless I can find a good metals library somewhere for
FTIR spectra. At any rate, I need to think about it a
while and see what I can come up with.
<br><br>Actually, the in-collar foldover isn't mine (at least yet),
I'm planning on purchasing it here in a few days if
it's still available. I need it for my type set and
like you said, it's rare! I haven't seen another
offered on e-bay yet. <br><br>The double foldover strike
is still "in the mail", but I'll scan it when I get
it for a blown-up image. I'm curious too about
pre-strike damage. Would that be worth less or more?
- It's not often that I address a post this old (8/24/2001). However,
I did get to see once again the 1962 cent that I thought had four
sets of raised, parallel profiles of Lincoln. My initial impression
based on a brief examination at a coin show was wrong. It actually
had four sets of INCUSE images. It was a shifted cap strike. The
coin had been struck through a die cap that had experienced three
previous shift-and-strike events.
So now I'm back to two sets of expansion ripples as the maximum I've
yet come across. I still don't have an explanation that I'm
comfortable with, though.
--- In firstname.lastname@example.org, dermestid wrote:
> You'll find in the "oddball errors" album an
> image of 10c capped die strike with one set of
> "expansion ripples" extending out from the head of
> Roosevelt. Expansion ripples are a set of vague raised
> outlines that parallel large central design elements such
> as busts and buildings. I have one other example in
> my collection -- a nickel.<br><br>I wrote a short
> article on this phenomenon some time back in Errorscope.
> In that article I presented I plausible theory to
> explain this phenomenon. At least it was plausible at the
> time. There's no need to go into the details, except to
> say that this theory can, at best, explain the
> existance of two sets of nested expansion
> ripples.<br><br>However, at a coin show in Chicago about a year
ago, I saw
> a Lincoln cent from the early '60s that showed FOUR
> sets of expansion ripples extending out from the front
> of Lincoln's bust. They became progressively fainter
> the farther out from the bust you went.
> Unfortunately, the owner wouldn't sell it at even $125. Maybe I
> should have offered more.<br><br>Has anyone out there
> seen multiple expansion ripples like this?