Byzantion, Thrace, AR tetrobol, 2.33 g. 357-340 BC, 

PY, Cow standing left, on dolphin.
Quadripartite incuse mill-sail pattern with granulated dots. 

Sear SG 1582; SNG Cop. 478.

With permission of Heidelberger Münzhandlung Herbert Grün auction 64, Lot 316, Nov 2014.