Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Tetradrachm (Silver, 20 mm, 14.95 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, kerykeon and star. Rev. Quadripartite incuse square with stippled quarters. HGC 7, 509. SNG BM Black Sea 96. Well struck and attractive. The reverse struck somewhat off center, otherwise, about extremely fine.