Watch List notes:

BITHYNIA. Kalchedon. Circa 367/6-340 BC. Tetradrachm (Silver, 24 mm, 15.00 g), Rhodian standard. KAΛX Bull standing left on grain ear; to left, [kerykeon] and monogram of ΔΑ. Rev. Quadripartite incuse square with stippled quarters. HGC 7, 509. RG 14. SNG BM Black Sea 93. Struck from a somewhat worn obverse die and with light scratches, otherwise, very fine.