Mysia, Pergamon, AE15. 

Obv: No legend, helmeted head of Athena right 
Rev: AQHNA, owl standing facing on thunderbolt, wings spread, NIKEFOPOY below. 

Ref: Goebl 43/24 (? according to the sales slip from the 1950s), 407 BC

Contributed by Dane, October, 2005