Watch List notes:

Pre-reform issues, Tabaristan ('Abbasid governors). Umar b. al-'Ala. AH 155-165 / AD 771-780. AR Hemidrachm (24mm, 1.93 g, 5h). TPWRSTAN (Tabaristan) mint. Dated PYE 128 = AH 163 (AD 779/80). Malek 79.1; Album 56. Faint marks . AU.