@prsferreira, it seems odd it me that the outline of the bust and whatever is on the rev are outlined in black, almost like they are inked or painted on the surface of the coin. Could you please immerse this coin in pure acetone and then post new pics? I'm probably wrong, but this might help.
"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