Megalopolis, Arkadia, AE19. Trichalkon, ca 80-50 BC. 3.69 g.

Laureate head of Zeus left.
ME-G, eagle standing right on thunderbolt, RKA monogram
in left field, PKA monogram in right field, all within wreath.

BMC 12; BCD Peloponnesos 1568.1. 
Very rare. 
Ex BCD Collection
 
With permission of cngcoins.com, April 2010