Hi, Joe .. Indeed, I have seen this sort of thing before, but not as strongly as this. Perhaps I'm getting too suspicious, but it looks a lot like paint or varnish that has dried into little folds (where liquid might have pooled) which stand higher than the rest of the surface. It would have been placed
obverse down to dry, because this hasn't happened on the
obverse.
If there's a cleaning fluid that does this, maybe the fluid has dried onto the surface of the coin. What could that fluid be, and how could it be removed? I'll try some obvious solvents and see what happens.
(Just seen Pat's comment) I agree completely!
Hands off! Or I can take
Ren Wax off very easily with white spirit. And if it's anything else, it could so easily be something which adds a colour of its own, which is a
type of fakery.
Bill