Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.80g), Madinat Herat, AH195, A-223.2, citing al-Ma'mun only as al-imam, unusual obverse border, consisting of 8 pairs of annulets and one single pellet, citng al-Fadl (b. Sahl) on reverse, lovely VF to EF, RR.

Estimate: 150-200 USD