Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Tetradrachm (Silver, 22 mm, 14.66 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, monogram. Rev. Quadripartite incuse square with stippled quarters. HGC 7, 509. RG 14. SNG BM Black Sea 97-8. Harshly cleaned and with light porosity, otherwise, good very fine.