Selymbria (or Dicaea), Thrace. AR Trihemiobol. 12 mm. 492-475 BC, 0.88g. 

Rooster standing right.
Head of Herakles right, wearing lionskin headdress, within incuse square.

Schönert-Geiss 57 (Dicaea); SNG Cop 790 (Selymbria).

With permission of cngcoins.com, auction 84, 143, May 2010.