BITHYNIA, Kalchedon. Circa 340-320 BC. AR siglos (5,31 g). Persic standard. KAΛX, Bull standing left on grain ear / Quadripartite incuse square of mill-sail pattern. Very light corrosion. Attractive cabinet toning., SNG Black Sea 112-6, HGC 7, 517, Grade: 1+/01, Purchased from a private Norwegian collection in early 2000s