Istros, Thrace, AR drachm. 20mm, 5.46 g. 4th century BC. 

Two male heads, the left inverted.
ISTRIH, Eagle standing right on dolphin, DI below.

Canarache 324.

With permission of M&M Numismatics Ltd with Ira & Larry 
Goldberg Coins & Collectibles, Auction 37, Lot 804. Jan 2016.