BITHYNIA, Kalchedon. Circa 340-320 BC. AR siglos (5,30 g). Persic standard. KAΛX, Bull standing left on grain ear / Quadripartite incuse square of mill-sail pattern. Small flan cracks. Attractive steel-grey toning., SNG Black Sea 112-6, HGC 7, 517, Grade: 1+/01, Ex Oslo Mynthandel, auksjon 64, 25.5.2010, lot 449