Watch List notes:

ABBASID, Al-Ma'mun (194-218 AH/810-833 AD). AR Dirhem (2.89 gm; 25 mm). obverse, Shahdah, mint: Balkh, year 199?, reverse, "Mohamad Rasoul allah" followed by name "Al Ma'mun as "commander of the faithful", followed by phrase/word "Bakh" (Admired). Album 223. Choice aEF. Toned. Extremely rare mint.