Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.87g), Arminiya, AH215, A-223.4, Vardanyan-84, citing the governors Khalid b. Yazid & Ibrahim b. 'Attab, struck from deteriorating dies, slightly wavy surfaces, VF, R. Struck with the same reverse die as the specimen illustrated by Vardanyan, but after both dies had lost some sections.

Estimate: 140-180 USD