THRACE, Abdera. Circa 411/0-386/5 BC. AR Stater (22mm, 12.83 g). Promethides, magistrate. 

griffin springing left

PRO-MH-QID-HS, Dolphin diagonally downward in linear square;  
all within shallow incuse square. 

May 343 var (no city name on obverse); Prospero 225.

Image courtesy of the New York Sale, the Prospero Collection.