This coin looks indeed as a Spanish Netherlands ducaton of 1638 or 1658 in the name of the Spanish king Philip IV. In Krause it is called a patagon KM#53.3 (mint mark Brussels), but it is in fact a ducaton as discribed in the specialized catalog of Vanhoudt "Atlas der Munten van Belgiƫ" (Atlas of the coins of Belgium from Celts until now) I441.
I am also cooncerned of forgery, as it seems to be struck on too small a planchet. Some other details don't seem right.

I am also cooncerned of forgery, as it seems to be struck on too small a planchet. Some other details don't seem right.





















