Istros, Thrace, AR Trihemiobol, 1.35 g. 4th C. BC. 

Two male heads facing, the right inverted.
ISTRIH, sea-eagle left on dolphin, dot beneath eagle's tail. 

Rauch 97, 88. Unpublished without Q beneath dolphin.

With permission of H. D. Rauch GmbH - Auction 97, Lot 88, April 2015.