Re: Pre or post mint?
- Jason's case of a zinc-plated cent reminds me of
another coin in my collection. I bought a beautifully struck,
uncirculated, apparently unplated zinc cent with a dark gray
coloration. At first I thought it was a normal cent that was zinc
plated outside the mint because it was slightly overweight (2.52
grams) and the surface was marked with a few microscopic bubbles
I didn't pay much for the coin, so I scraped the edge against a fine-
grained sharpening stone. Believe me, I gave it a good, hard
scrape. Lo and behold, no copper lay beneath the surface. It turned
out to be legit. I can only assume that the planchet itself was
slightly overweight, and the scattered bubbles were created by some
step in processing. The copper plating could not have been
chemically stripped off outside the mint. If this had been the case,
the surface would show some roughness and the design features would
be a little mushy.
It just goes to show you how tricky some of these errors can be.
--- In errorcoininformationexchange@y..., "dermestid" <mdia1@a...>
> That's certainly definitive. You went through the zinc platingthat
> was applied outside the mint, then through the copper plating, andnot
> down to the zinc core.
> Sometimes invasive methods are the simplest and most direct way to
> solve a mystery. You have proven my point that plated coins are
> necessarily heavier than a normal coin.coin.
> > Well, I got permission from the owner to test the rim of the
> > said "go for it". Here are the results:
> > http://home.pacifier.com/~craton/plated.JPG
> > Jason