Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Tetradrachm (Silver, 23 mm, 14.94 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, monogram of ΔΑ. Rev. Quadripartite incuse square with stippled quarters. HGC 7, 509. RG 14. SNG BM Black Sea 93. The obverse struck somewhat off center, otherwise, very fine.