Seleucid Empire. Seleukos I. 312-280 B.C. AR Tetradrachm. 17.15 g. 28 mm. Alexander Anchor group II. Babylon mint. 311-305 B.C. Ob: Head of Herakles r. wearing lion scalp. Rx: Zeus Aetophorus seated on throne l. with eagle and scepter. To l. anchor and monogram. Price 3353.