Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.89g), Madinat Balkh, AH199, A-223.4, Lowick-2190, citing only the vizier by his title Dhu'l-Ri'asatayn, and the word al-mashriq ("the East") below the obverse field, very rare date, VF, RR.

Estimate: 150-200 USD