Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR dirham (2.93g), Madinat Zaranj, AH204, A-223.4, anonymous, citing the regional governor Ghassân and the local governor al-Layth below the reverse field, VF, RR. Very rare type, with no examples cited on CoinArchives.

Estimate: 150-200 USD