Watch List notes:

BITHYNIA. Kalchedon. Circa 340-320 BC. Siglos (Silver, 16 mm, 5.30 g), Persic standard. KAΛX Bull standing left on grain ear. Rev. Quadripartite incuse square of mill-sail pattern. HGC 7, 517. SNG Black Sea 112-6. Beautifully toned. Nearly extremely fine.