Pergamum, Mysia, AE13, civic issue, engraver's error. Ca. 200-100 BC. 0.84 g.

Head of Athena right, wearing crested Corinthian helmet ornamented with a star.
NIKHFOROY AQHNAS, owl standing slightly right, head facing, wings closed.

BMC 185-186. 

With permission of Gitbud & Naumann, auction 42, lot 195.