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Eukratides, Baktrian king, 171-135 BC. AR tetradrachm.

Diademed and helmeted bust right, wearing crested helmet 
adorned with the ear and horn of a bull.
BASILEWS MEGALOY EYKRATIDOY, the Dioskuri riding right, 
each holding a palm branch and a spear.
PTAR monogram at lower right.

Whitehead 67; BMC 10.