Istros, Thrace, AR Drachm. 15.9 mm, 5.77 g. ca 400-350 BC. 

Obv: Two facing male heads, one inverted. 
Rev: ISTRH above eagle standing left on dolphin, FY below.

AMNG 425; SNG Black Sea 256.

With permission of TimeLine Auctions (www.timelineauctions.com), May, 2015