ISLAMIC, 'Abbasid Caliphate. temp. Al-Amin, AH 193-198 / AD 809-813. Dirham (Silver, 24 mm, 2.64 g, 10 h), citing the heir al-Ma'mun as 'al-Imam' and as ibn Amir al-Mu'minin ('son of the Commander of the Faithful' in Kufic). Also citing al-Fadl, the vizier of the Caliph, Samarqand, AH 195 = AH 810/1. SICA III, 859. Very fine.
From a Swiss collection of Umayyad and Abbasid coins, assembled in the 1970-1980s (with original flip with S. Album's description).
This type was formerly assigned to al-Ma'mun.