Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. al-Ma'mun. AH 199-218 / AD 813-833. AR Dirham (27mm, 2.87 g, 3h). Citing 'Ali ibn Musa al-Rida as heir. Madinat Isbahan mint. Dated AH 202 (AD 817/8). Album 224; ICV 391. Good VF, lightly toned.