Istros, Thrace, AR Drachm. 18 mm, 5.08 g. ca 400-350 BC. 

Two facing male heads, the left inverted. 
ISTRH above eagle standing left on dolphin, FY below.

AMNG 425; Mionnet Supp. II, 85; SNG Stancomb 148; Canarache 179 and 238; Dima III-VI-1.

With permission of Leu Numismatik Web Auction 11, lot 659, Feb. 2020.