Tabaristan ('Abbasid governors). Yahya b. Mikhnaq. AH 162-165 / AD 779-781. AR Hemidrachm. Tabaristan mint. Crowned Tabaristan-type bust right / Fire altar flanked by attendants; star and crescent flanking flames; pellet above second 't' of mint name; alternating two pellets and star-in-crescents in outer margin. 25 mm, 1.90 g.