ISLAMIC, 'Abbasid Caliphate. temp. al-Ma'mun. AH 199-218 / AD 813-833. AR Damma (0.57 g, 11h). Issue of Bishr ibn Da'ud ibnYazid al-Muhallabi, 'Abbasid governor of Sindh (AH 205-211 / AD 820-826). Uncertain mint in Sindh. F&T CS13; Album –; ICV –. Bright surfaces, deposits, area of flat strike on reverse. Fine. Very rare.