Well, it's definitely Seleucid. The portrait looks female though, and I don't think that's too common. Unless I'm confusing glamorous male hair...
I believe it is the same type as this, which is from Mesembria in Thrace. Thrace, Mesambria, Circa 175-100 BC. (Orichalcum, 20 mm, 6.12 g), Diademed female head to right. Rev. METAM-BPIANΩN Athena Promachos advancing left, holding shield left and brandishing spear with her right; to inner left, Λ.
