Watch List notes:

Abbasid, temp. al-Ma'mun, Dirham, 2.93g, Madinat Isbahan, AH202, al-mashriq below legend, rev. citing the Shi'ite Imam 'Ali bin Musa al-Rida as heir, with dhu'l riyasatayn below legend (A.224), extremely fine and rare.
This lot, and the following five, mark an interesting early attempt by al-Ma'mun to reconcile the Sunni and Shi'ite branches of Islam by naming the Shi'ite Imam 'Ali bin Musa al-Rida as his heir.
(£400 - £500)