Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR heavy dirham (3.85g), Fars, AH202, A-223A, citing only the vizier as dhu'l-ri'asatayn, VF-EF, RR. This heavy dirham was struck only at Fars 199-203, Marw 198-202, and Samarqand 203.

Estimate: 150-200 USD