Diademed and radiate bust of Zeus/Mithra right wearing Phrygian cap, Greek legend BASILEOS BASILEON ERMAIOU. 

Horse prancing right, monogram to right & Kharoshthi legend Maharajasa tratarasa Heramayasa around.

EU-903. Wt = 8.52g

Hermaeus (70-50 BC), copper coin, struck to Indian standard, MAC 1960

Photo from Classical Numismatic Gallery, sale 37, lot 108