I like the curl on the top flag of the E. It shows that the plating was stretched upon the strike. PS..... I like the close up.
CONECA might be the answer. I think Sal was hoping for Fred or Mike to perhaps chime in. I think the earlier set of photos was better. In those it appears that it’s attached plating with a jagged edge. What’s peculiar is that the rim edge is without plating. So, 2 copper plate islands of sorts. It could be a plating bond issue. For that to be, the planchet was only submersed/cleaned where the plating remains. But why not the rim too? If the obverse/reverse planchet were cleaned then the rim should be too. It’s hard to envision how just a bit of the planchet was cleaned while most of it remained oily suspended in a basket oddly? If dipped in acid, why the ragged edge on the copper? And how did it get up around the trims edge? If plated, why the ragged edge? It is interesting.
I called it real. Of course, that is always an in hand look at the coin. I really don't or haven't seen many that the zinc shows brilliant luster, and haven't inspected the cut to the copper. My thoughts are that it is consistent with the edge of a cutting mill.
Grading is not the most important thing here. No point having it in a slab with some grade against it. It needs to be attributed so the slab label also states the error, if it is one. But that is an extra cost.
So I heard that there's a place in Florida where they specialize in error coins called Sullivan Numismatics, Inc. and contacted them.
What are they calling this at PCGS? You said you asked there but you never told us that. They’ve experts there we don’t have here, or who only infrequently visit here. They’d know whether this were a Mint error.
PMD , the mint electroplates the zinc planchet with copper. You don't see distinct lines by electroplating, more granular deposits, IMO. Jim