'Abbasid Caliphate. Al-Ma'mun. AH 194-218 / AD 808-833. AR Dirham (25.9mm, 3.06 g, 2h). Samarqand mint. Dated AH 202 (AD 817/8). Citing the Shi'ite 'Ali b. Musa al-Rida as caliphal heir. Lowick 2678; SICA 3, 912-3; SCC 1165; Album 224. Minor spotting. Good VF. Rare.
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