Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. Al-Rashid, AH 170-193 / AD 786-809. Dirham (Silver, 25 mm, 2.81 g, 3 h), citing the future caliph al-Ma'mun, as as 'Wali Wali 'ahd al-Muslimin' ('successor of the successor of the covenant of the Muslims' in Kufic) and as ibn Amir al-Mu'minin ('son of the Commander of the Faithful'), Ali ibn Isa ibn Mahan, Balkh, AH 189 = AD 804/5. SICA III, 692. Scratches and with minor deposits, otherwise, very fine.

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