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First of all it is not struck on copper. It's a normal clad quarter. Clad is Cupro-Nickel. 75% Copper and 25% Nickel. Environmental Damage is what occurs when it's exposed to the elements for a very long time.
What about the shrapnel mestal piece in reverse Like i said I was just trying to figure out whether or not it was error
Not an error - that 'shrapnel' piece is probably part of the badly environmentally damaged surface event - it looks like it was over the damaged surfaces, and would have been the same dark copper color as the rest of the surfaces if it had been there when minted.
Looks like a nickel I found on the shore of the Potomac river one time. What with all the pollutants in the river it was no wonder it looked the worse for a couple of years on the shore.
When I was a kid I had a metal detector and the majority of coins I used to dig out of the lawns looked just like this quarter.