Thrace, Byzantion AR Drachm (ca 387/6-340 BC)
Obv: Bull standing to left on [dolphin]
Rev: Stippled quadripartite incuse square in mill-sail pattern.
Ref: SNG Stancomb 1, Corpus Nummorum 5975, Schönert-Geiss 731; SNG BM Black Sea 8-11 var. (control under raised foreleg); HGC 3.2, 1387.