Pergamum, Mysia, AE12, civic issue, engraver's error. Ca. 200-100 BC. 0.98 g.

Head of Athena right, wearing crested Corinthian helmet ornamented with a star.
NIKHF(OROY) AHQNA(S) (instead of AQHNAS), owl standing slightly right, head facing, wings closed.

Error issue of BMC 185-186. 

Dane's collection, Nov. 2018.
Ex Kairos auction