@s4c, that half-moon splotch of different color is just a difference in surface toning. Either this area was exposed to a drop of a chemical which partially stripped the toning there or else there was something there (like dried glue) that protected this area from toning. Interestingly, the star and letters ARTE contained within this region are toned like the rest of the coin.
"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
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