Watch List notes:

Vologases IV (147-191), Tetradrachm, Seleukeia on the Tigris, AD 166; AR (g 13,13; mm 26; h 12); Bearded bust l., wearing double banded diadem and tiara; behind, B, Rv. ΒΑΣΙΛΕΩΣ / ΒΑΣΙΛΕΩΝ / ΑΡΣΑΚΟY / OΛΑΓΑΣΟΥ / ΔΙΚΑΙΟY / ΕΠΙΦΑΝΟYΣ / ΦΙΛΕΛΛΗΝΟΣ, king enthroned l., receiving a diadem from Tyche l.; above, HOY. Sellwood 84.33 var (month).
Lightly toned, about extremely fine.