Watch List notes:

BITHYNIA. Kalchedon. Circa 387/6-340 BC. Drachm (Silver, 14 mm, 3.79 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeion and monogram of ΔA. Rev. Quadripartite incuse square with stippled surfaces. RG 13. SNG BM Black Sea 104. Light porosity, otherwise, very fine.