Abdera, Thrace. AR Tetradrachm, ca 492-473 BC. Magistrate Asga... 14.8 g. 

ASG-A, griffin springing left with both forelegs raised.
Quadripartite incuse square.

May 60; Hunter 2; AMNG II, 17; Prospero 219.
Extremely rare.
 
Image courtesy of the New York Sale, the Prospero Collection.