Methymna AR Diobol ca 500-450 BC. 1.35g. 

Facing head of Gorgoneion, tongue protruding.
Head of Athena? left, wearing Corinthian helmet, within dotted incuse square. 

Traite Pl. 15, 21; Franke, Methymna 5

Courtesy of Münzen and Medallien Auction 8 (May 2001), lot 171 
DM 500 ($223) + fees.