Piakos, AE Tetras, Bronze, 425-410 BC. 

P-I-A-K between three dots (value mark) to left of laureate and horned head of youthful rivergod left.
Hound right attacking a stag, barley corn to left and right.

Calciati 2; Hoover HGC 1101. 
Very rare. 

With permission of Münzen & Medaillen DE, June 2015