Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (3.05g), Samarqand, AH197, A-223.4var, citing the vizier Dhu'l-Ri'asatayn (= al-Fadl b. Sahl), and with the hitherto unreported legend above the reverse field, imam lillah al-'adl ("Imam, justice is God's"), VF, RRR.

Estimate: 200-300 USD