Bactria, Antimachus I, c. 180-170 BC. Tetradrachm; Bactria, Antimachus I, c. 180-170 BC; Tetradrachm, 16.85g. Bopearachchi-1D, Mitchiner-124b. Obv: Diademed and draped bust of king r., wearing kausia. Rx: Poseidon, standing facing, holding trident and filleted palm, monogram in r. field.. aEF / VF