Achaios, Seleukid Kingdom, usurper, AR tetradrachm. 220-214 BC. 28 mm. Sardes mint. 

Diademed and draped bust right.
BASILEWS AXAIOY to right and left of Athena Promachos walking left, brandishing spear in right hand, shield on her left arm. 

Horse's head and neck left in inner left field, P over Y in inner right field.

Newell WSM 1440; Houghton SC 953.1; Jameson 1692 (this coin); GRPC Lydia S294  (ditto).