1987-D Lincoln Cent - possible new RPM? If not, what is this?
Also, is it possible to safely remove the gunk? I'm willing to do anything as long as PCGS wouldn't grade it as "cleaned." I guess I want to "restore" it.
Rather than an RPM, it looks more like split copper plating is letting the zinc core start to corrode, much like the coin in this prior thread with an excellent explanation by @coop:
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