Watch List notes:

(x) Abbasid, al-Ma'mun (810-833), gold Dinar, 4.27g, mintless type, AH198 (Egypt), citing governor al-'Abbas below legend, rev. al-Imam above legend and al-Ma'mun below (Album 222.3; Bernardi 84), extremely fine, rare.

Estimate: £250 - £300