Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.92g), Wasit, AH200, A-223.4, Lowick-1485, citing al-Hasan below the obverse field, Dhu'l-Ri'asatayn below reverse, very rare mint for al-Ma'mun, choice EF, RR.

Estimate: 260-350 USD