Did you see the coin I posted in that other thread that I sent a link to? I'm seeing many similarities between your coin and my coin.
me also, but mine is thinner then a piece of paper. I think it very well could be a thin planchet that was acid dipped, however I respect Paddyman and thats that, what he says goes. Im just in awe that it can get this thin. Id buy another for a quarter, and anything else for that price that looks off just to learn.
I knew the moment I looked at it in your other post that it was an extreme acid-dipped example. The diagnostics are flawless; if you measure carefully enough (not that it's possible) I suspect you'll find that the decrease in diameter from each side equals the decrease in thickness, also from each side, or very close to. Acid eats uniformly and accurately, in predictable fashion. With good enough imagery you can come to a pretty decent feel for the grade of the original coin - the acid etching is that consistent. You can even see the inconsistent planchet alloy composition on the reverse - I bet it was a Woody. I'd buy that thing ten times out of ten, and wear it out the rest of the way posting it on forums over the next ten years. It's an ideal educational tool.