Watch List notes:

ISLAMIC. Abbasid Caliphate. al-Ma'mun. AH 194-218 (AD 810-833). AR dirham (2.94 gm; 25 mm). Madinat Isbahan mint. Dated AH 202, inscribed al-mashriq ("the east") below obverse field, and citing the vizier (al-Fadl b. Sahl) by his title Dhu'l-Ri'asatayn ("possessor of two commands") below reverse field, with two pellets below and a third pellet above the "dh" of the vizier's title. Album 223.4. Choice AU with luster. Rare date for this type.