Watch List notes:

MOESIA. Istros. Circa 280-256/5 BC. Drachm (Silver, 17 mm, 5.55 g, 12 h). Two facing male heads side by side, one upright and the other inverted - a tête-bêche pair. Rev. ΙΣΤΡΙΗ Sea eagle standing left on dolphin; below dolphin, A. AMNG I 416 var (inverted heads). Dima Subgroup VIII. HGC 3, 1804 var (inverted heads). SNG BM Black Sea 240. Old cabinet tone, good medal quality. Struck from a slightly worn obverse die, otherwise, nearly very fine.
From an old Swiss collection formed prior to the 1990s.