Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.84g), Zaranj, AH207, A-223.4, citing the governor Ibn al-Qusi and the commander Dhu'l-Yaminayn (=Tahir b. al-Husayn, founder of the Tahirid dynasty), wavy surfaces, F-VF, RRR.

Estimate: 120-160 USD