First the coin:
A attractive little thing, I like the off center strike that has the portrait kind of peering out at us from off to one side.
As to its origins the odd "bottle cap" pattern gives a general clue. Coins of this sort were poured into special molds before being struck. By one theory the serrated edge assured those who accepted the coin that it was solid metal, although with cheap bronze it is hard to see why this was an issue. This type was pretty much only used by the Seleucid Empire.
The Seleucids were the Rodney Dangerfields of the ancient world, never got no respect. Their sprawling domains stretched across Turkey out into Afghanistan and even into India. But this remnant of Alexander the Great's conquests got eaten up by the Persians on the East and the up and coming Roman Empire on the West.
I would love to have somebody identify this coin but to my eyes all the Seleucid coinage looks similar, vaguely smiling androgynous kings and deities.