Mysia, Pergamon, AE, Reigns of Philetaerus, Pergamon. 

Obv: Helmeted head of Athena right, helmet decorated with griffin
Rev: FILE above, TAIROU and D below strung bow. 

SNG Cop 350 var (has theta below); BMC 59 var (has O below); Mionnet Supp. 5, 1201 var (has M below)

Isegrim -; Mionnet -; SNG Cop -; SNG von Aulock -; etc. Possibly unpublished with delta below.

With permission of Roland Müller. Coin added April 2013.