It looks like an ordinary Joćo I from up to 1433, but to me, the obverse looks like there are both Lisbon and Porto mintmarks, two crowns, and two ing's initials. I don't claim I found a treasure, but I just want to know what, if anything, is going on here!
Jay, I'm a little out of my comfort zone with this coin, so work with me. I see the smushed up L to the left of the King's monogram on the obv, which is the Lisbon mintmark. Where is the P for Porto? Wouldn't it be located in the same spot as the L?
"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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