Is there a thread here in the forum that explains the acetone process in detail? I can't seem to find one
I have been looking at the coin with my USB microscope. I don't think there will be an issue with the patina, but I had better err on the side of caution as to possible PVC. I do see a green 'haziness' in places, but I do not see any pitting or other damage to the surface of the coin.
OK, here are new picture after a quick bath in acetone to remove/clean any PVC.