@mrw, first welcome to CCF. Second, I agree with @sel, that this coin most likely didn't leave the mint looking like this. Rather someone has altered it, either by rubbing with mercury as suggested or else stripping off the copper plating or else plating with, for example nickel, on top of the copper plating. My personal opinion is that it most looks like the copper plating has been removed, but in any case you coin is worth only face value.
"If you climb a good tree, you get a push."
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz























