Baktrian Kingdom. Eukratides I. Silver Tetradrachm (16.9 g), ca. 171-145 BC. Diademed and draped bust of Eukratides I right. Reverse : BAΣIΛEΩΣ EYKPATIΔOY, the Dioskouroi riding on horses rearing right, holding palms and spears; in left field, PK monogram; in lower right field, Δ. Bopearachchi 1C;