Istros, Thrace, AR drachm. 18mm, 5.58 g. 313-280 BC. 

Facing male heads, the left inverted.
ISTRIH above sea-eagle left on dolphin. Gamma beneath dolphin.

BM Black Sea 241; BMC 8; Canarache 174.

With permission of Numismatik Naumann, March 2016.