Kings of Bithynia, Prusias II Cynegos AE (Bronze, 5.19g, 21mm) Nikomedia, ca 182-149 BC.
Obv: Ivy-wreathed head of Dionysos to right
Rev: The centaur Chiron walking to right, cloak over shoulder, playing lyre; BAΣΙΛΕΩΣ to right, ΠΡΟΥΣΙΟΥ to left, monogram between forelegs.
Ref: RG 26; SNG Copenhagen 641; HGC 7, 629.