Watch List notes:

BITHYNIA, Kalchedon. Circa 260-220 BC. AR Tetradrachm (29.5mm, 16.50 g, 1h). In the name and types of Alexander III of Macedon. Head of Herakles right, wearing lion skin / Zeus Aëtophoros seated left; monograms in left field, grain ear on exergue line. Price 922 (Kallatis); Türkoğlu –; HGC 7, 521. Good VF, toned, area of weak strike on reverse.

From the Colin E. Pitchfork Collection. Ex Spink 159 (11 July 2002), lot 907.