Watch List notes:

Pre-reform issues, Tabaristan ('Abbasid governors). Umar b. al-'Ala. AH 155-165 / AD 771-780. AR Hemidrachm (23.9mm, 1.94 g, 11h). TPWRSTAN (Tabaristan) mint. Dated PYE 122 = AH 157 (AD 773/4). Malek 66.1; Album 56. Lustrous. AU.