Copper over brass coin?

[brian11]

Not sure this is a coin. It is very thin (now). Probably was about the thickness of a dime originally. It is slightly smaller than a nickle.
It appears to be brass, but I can see with a magnifying glass that there are still bits of copper still attached on it. Ideas?

 

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[cudamark]

Looks like a toasted zinc cent.

 

[brian11]

No.....it's slightly bigger than a penny...

 

[bradyboy]

electrical box nock out?
Brady

 

[can]

electrical box nock out?
Brady

that what it looks like