Heraia, Arkadia, AE Dichalkon, 14 mm, 2.49 g, ca 380-350 BC. 

Helmeted head of Athena left.
Large H with four dots around it. 

BCD Peloponnesos 1363 (this coin).
Rare.

With permission of Baldwin's Auctions & Dmitry Markov & 
M&M Numismatics, Jan 2008.
Ex BCD Collection.
Estimate: $150