Parthian Kingdom. Mithradates I. Æ Tetrachalkon (9.24 g), 164-132 BC. Ekbatana, ca. 147/6 BC. Diademed and draped bust of Mithradates I right. Reverse: The Dioskouri on horseback galloping right. Sellwood 12.10; Shore -. Rare. Brown patina. Very Fine. Estimate Value $300 - 350