Bithynia, Kalchedon. AR Trihemiobol or 1/4 Siglos, 1.15 g 10.18 mm. Circa 340-320 BC. Obv: Bull standing left, grain ear below. Rev: KA, Quadripartite incuse square of mill sail pattern. Ref: SNG Black See 124-126; HGC 7, 519. Fine