Watch List notes:

Bithynia, Kalchedon. Ca. 340-320 B.C. AR half siglos (hemidrachm) (13.7 mm, 2.44 g, 11 h). KAΛX, bull standing left, grain ear below / Quadripartite incuse square, mill-sail pattern. SNG BM Black Sea 118-23; Rec Gen 9; BMC 9. Toned aVF.