Pergamum, Mysia, AE17, autonomous issue, late 3rd century BC. 

Obv: Head of Athena right wearing Corinthian helmet decorated with star. 
Rev: AQHNAS NIKHFOROY, above and beneath owl standing 
facing on palm branch, wings spread. TK monogram in left 
field, PL monogram in right field.

SNG Cop 392 (these monograms).

With exclusive permission of TimeLine Auctions (www.timelineauctions.com), Sep. 2014