ISLAMIC, 'Abbasid Caliphate. Al-Ma'mun. AH 199-218 / AD 813-833. AR Dirhem (23mm, 2.94 g, 10h). Citing Dhu al-Ri'asatayn. al-Muhammadiya (Ray) mint. Dated AH 199 (AD 813). Album 223.4. Near EF, lustrous, area of weak strike on reverse.
From the J.-P. Righetti Collection.