Watch List notes:

BITHYNIA, Kalchedon. Circa 367/6-340 BC. Tetradrachm (Silver, 21mm, 15.20 g), Rhodian standard. KAΛX Bull standing left above grain ear; B monogram to left. Rev. Quadripartite, granulated incuse square. SNG Black Sea 98. SNG von Aulock 486. Bull's head struck flat, otherwise, very fine.