Watch List notes:

'Abbasid Caliphate. temp. Al-Mahdi. AH 158-169 / AD 775-785. 'Umar b. al-'Ala. AH 155-165 / AD 775-785. AR Hemidrachm (23.2mm, 1.97g, 9h). Tabaristan mint. Dated PYE 125 = AH 160 / AD 776/7. Obverse: Name and patronymic of governor both in Pahlawi (before bust) and in Arabic (in margin). Malek 77; Album 57. Choice EF. A one-year type.

Ex Morton & Eden (London) Auction 210, (15 October 2020), lot 1032.