Watch List notes:

ABBASID, AL-MA'MUN (194-218h), Dirham, al-Muhammadiya 204h. Reverse: citing the Shi'ite al-Rida as heir to the caliphate. Weight: 2.91g References: Lowick 1969; Miles, Rayy 105B. Good very fine and rare

This very rare type of al-Rida’s coinage has annulets in the outer margin in place of the usual Qur’anic legend, and omits his personal name ‘Ali bin Musa. (500-700 GBP)