BITHYNIA, Kalchedon. Circa 260-220 BC. AR Tetradrachm (26mm, 16.80 g, 1h). In the name and types of Alexander III of Macedon. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; in left field, (ΠA)Σ monogram above K; grain ear in exergue. Price 933 var. (monogram); Black Sea Hoard 41 (same dies). VF, slight die shift on reverse. Rare.