Istros, Thrace, AR Drachm, 5.57 g. 4th century BC. 

Facing male heads, the left inverted.
ISTRIH, sea-eagle left on dolphin, H beneath eagle's wing, 
Delta dot beneath dolphin. 

Canarache 252. 

With permission of Ira & Larry Goldberg Coins & Collectibles, Auction 85, Lot 3023. June 2015.