ISLAMIC, 'Abbasid Caliphate. temp. Al-Mansur, AH 136-158 / AD 754-775. Dirham (Silver, 25 mm, 2.95 g, 8 h), citing the heir apparent as 'al-Mahdi Muhammad ibn Amir al-Mu'minin', al-Muhammadiya, AH 150 = AD 767/8. SICA III, 1312. Minor marks and with light deposits, otherwise, good very fine.