Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Drachm (Silver, 15 mm, 3.78 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeion and monogram of ΔΑ. Rev. Quadripartite incuse square with stippled quarters. HGC 7, 511. RG 15. SNG BM Black Sea 104. Harshly cleaned and with an edge crack, otherwise, about extremely fine.