Watch List notes:

BITHYNIA. Kalchedon. Circa 340-320 BC. Drachm or siglos (Silver, 19 mm, 5.24 g). KAΛX Bull standing to left on a grain ear. Rev. Quadripartite incuse square. HGC 7, 517. SNG BM Black Sea 112. Lovely old cabinet tone. Scattered marks and light porosity, otherwise, nearly extremely fine.
From the Moesa Collection, Switzerland and from the Baldwin Maull Collection, USA.