It is also not a good idea to keep coins in vinyl 2x2's, the one in the picture looks to be vinyl. You can tell by how flexible it is, Mylar is not very flexible while vinyl is quite supple.
I could probably make a quarter into a much larger size round(gold quarter dollar leaf anyone?) ok, not that thin but I could probably get it pretty thin. Naughty Khromtau for thinking about destroying money!
These three videos might help a little to get started as there are both real mint errors and many varieties to find and there are also damaged coins. Learning the differences just can take a bit of time. When new, a lot of people might think something might be valuable, or at least pull things out that are different but really just damaged. As far as varieties to look for, there is also a book like this that will help get you started https://www.amazon.com/Strike-Rich-...p/0593328604
I wonder if this is an attempt to fill dollar rolls with mutant coins? For every one of these the perpetrator inserts into a roll, he's $0.75 ahead of the game. A variation of the old washer trick?
"Nummi rari mira sunt, si sumptus ferre potes." - Christophorus filius Scotiae
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Posted 03/25/2023 11:06 pm
Uncirculated American Silver Eagles 
ok, not that thin but I could probably get it pretty thin. 
Naughty Khromtau for thinking about destroying money!
with Earle42, he hit out of the park.
