Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Drachm (Silver, 15 mm, 3.81 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeion and monogram of ΔA. Rev. Quadripartite incuse square with stippled surfaces. HGC 7, 511. SNG BM Black Sea 104. Extremely fine.