I don't think I have anything, but was just wondering. Sorry for the terribal pics. looks rusty copper color.
Normal thickness as a Nickel? Normal weight on a Nickel? Devices show near the rim. Environmental issue. If the Nickel is thinner, the devices fall over the edge of the rim it is a nickel struck on a Cent planchet.
It is impossible to tell from the picture...but one possibility is it could be a improperly annealed (sintered) planchet. Here is an example from my collection:
Don't jump into conclusions:rolling: unless you see better pics of the coin it could be a sinthered planchet. JC