Istros, Thrace, AR Drachm, 17mm, 5.97 g. Late 5th-4th century BC. 

Facing male heads, the right inverted.
ISTRIH, sea-eagle left on dolphin, D under eagle's tail,
RXA monogram beneath dolphin (head of R turned inwards).

AMNG 432; BM Black sea 243; Leake 55; Canarache 106.

With permission of Roma Numismatics, Aug. 2015