The Abbasid Caliphate. Umar ibu al-Al (?) AH 155-165 (771-782 AD). AR Hemidrachm, struck under the Abbasid Governors of Tabaristan, dated PYE 125 (AH 160, 776 AD). D/ Bust in style of the Sassanian Emperors facing, head right, wearing winged crown. R/ Fire-altar flanked by two stylized figures in Sassanian style. Malek 77. AR. g. 2.08 mm. 24.00 EF.