ISLAMIC, 'Abbasid Caliphate. temp. Al-Mansur, AH 136-158 / AD 754-775. Fals (Bronze, 23 mm, 2.74 g, 5 h), citing the heir apparent al-Mahdi Muhammad and the governor Harb ibn Ziyad, Balkh, AH 149 = AD 766/7. Album 319. Rare. Harshly cleaned and with a large flan fault, otherwise, about very fine.