Watch List notes:

Thrace, Byzantion. 357-340 B.C. AR hemidrachm (13.6 mm, 2.52 g, 12 h). ΠΓ, Heifer standing left, dolphin below / Quadripartite incuse square, mill-sail pattern. SNG Black Sea 39; BMC 15. VF. 

Ex Athens collection. In Hollander holder.