Watch List notes:

Pre-reform issues, Tabaristan ('Abbasid governors). Umar b. al-'Ala. AH 155-165 / AD 771-780. AR Hemidrachm (23.3mm, 1.71 g, 2h). TPWRSTAN (Tabaristan) mint. Dated PYE 129 = AH 164 (AD 780/1). No pellet above mint-name. Malek 80.1; Album 56. AU.