Istros, Thrace, AR trihemiobol. 1.26 g. 4th c. BC. 

Facing male heads, the right inverted.
ISTRIH above sea-eagle left on dolphin. PY monogram beneath dolphin. 

Aureo & Calico, 274, Lot 1004. Unpublished monogram.

Sold by Áureo & Calicó, Auction 274, Lot 1004, Feb. 2016.
Estimate: 100 Euro