Watch List notes:

Thrace (Moesia Inferior), Istros, (400-350 B.C.), silver trihemiobol (quarter stater Sear), (1.09 g), obv. two young male heads facing, side by side, left upright, right inverted, rev. ISTPIH above sea-eagle standing to left on dolphin to left, which it attacks with its beak, below dolphin D, and Q below eagle tail, (S.1670, Pick -, SNG BMC -, SNG Stancomb -, SNG Cop. -, Dima table III, Group IV, subgroup III, [R] and dates 340/330 - 313 B.C., HGC 3, 1806). Attractively toned, nearly extremely fine, extremely rare variety.

Ex Numismatik Lanz, Munich, Auction 102, 28 May 2001 (lot 87). This coin the only recorded example of these letters in Coin Archives (illustrated),