Pharsalos AR hemiobol, mid to late 5th century BC. 8mm, 0.45 g. 

Helmeted head of Athena right.
F-A-R (anticlockwise from lower right), head and neck of horse right within incuse square.

Lavva 22.

With permission of cngcoins.com, auction 90, lot 164, May 2012.
Ex BCD Collection.