Watch List notes:

BITHYNIA, Kalchedon. Circa 260-220 BC. AR Tetradrachm (29mm, 16.91 g, 12h). In the name and types of Alexander III. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; HP monogram in left field, Θ below throne; grain ear in exergue. Price 936 (Callatis); Türkoğlu –; HGC 7, 521. Iridescent tone, a little die wear on obverse, slight doubling on reverse. EF.

From the D.K. Collection. Ex Goldberg 55 (29 October 2009), lot 36.