Elaea, Aeolis, 340-300 BC. 

Obv: Prow of galley right, countermark above: diademed male head right.
Rev: ELAI within laurel wreath. 

Sear Greek 4202; Mionnet III, 85; Weber 5548; SNG Copenhagen 889-90 (all without countermark).

I couldn't find a similar one with the head countermark.

Contributed by George Clegg (biggyg2), Feb, 2011