Not a punch-out - you will usually see where it was connected to the electrical box. Not a planchet Either - There is no proto rim. Could be a ground down copper cent.
I'm trying to remember when the zinc planchets get the copper plating. I think it is AFTER the upsetting mill. And if that is true, then I doubt that it is a zinc blank as well.
(I have a zinc blank and it is not plated - have a look:
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