Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Drachm (Silver, 17 mm, 3.69 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 struck on an oval flan, otherwise, about extremely fine.