ISLAMIC SILVER COIN - ARAB-SASANIAN, 'Abbasid Governors of Tabaristan, 'Umar (b. al-'Ala), AD 771-780, AR 1/2 Drachm, PYE 127. Hemidrachm, 1.90 gm; 23 mm, Islamic, Arab-Sasanian, 'Abbasid Governors of Tabaristan, 'Umar (b. al-'Ala), PYE 120-129/ AD 771-780, AR hemidrachm or "Tabari" drachm (Tabaristan mint, PYE 127 (AD 777/8). Khusru II -type bust r., Arabic 'Umar before face. R: Fire altar with attendants, Pahlavi mint and date. Extremely Fine, nearly as struck.