ISLAMIC, 'Abbasid Caliphate. temp. Al-Rashid, AH 170-193 / AD 786-809. Dirham (Silver, 26 mm, 3.00 g, 4 h), citing the future caliph al-Ma'mun as the heir apparent and Ali ibn Isa ibn Mahan, Balkh, AH 189 = AD 804/5. SICA III, 692. Minor areas of weakness and the flan slightly wavy, otherwise, extremely fine.

Ali ibn Isa ibn Mahan was a prominent military leader and governor of Khorasan under the caliph Harun al-Rashid.