Watch List notes:

BITHYNIA, Kalchedon. Circa 260-230s BC. AR Tetradrachm (32mm, 16.50 g, 11h). In the types of Lysimachos of Thrace. Diademed head of the deified Alexander right, with horn of Ammon / Athena Nikephoros seated left, arm resting on shield, spear in background; monogram to inner left, grain ear in exergue. Marinescu Issue 24, 58 (O21/R56); HGC 7, 523. Scattered marks and scratches, double struck on obverse. VF. Very rare, only two examples of issue 24 listed in Marinescu.