BITHYNIA, Kalchedon. Circa 260-220 BC. AR Tetradrachm (28mm, 16.85 g, 1h). In the name and types of Alexander III of Macdeon. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; KA monogram in left field, monogram below throne; grain ear with stalk in exergue. Price 930 (Kallatis); HGC 7, 521. Iridescent tone, underlying luster. Good VF. Wonderful style.