Watch List notes:

ABBASID: al-Ma'mun, 810-833, AR ¼ dirham (0.75g), al-Muhammadiya, AH209, A-223I, mint name reasonably clear, same style as the half dirham of al-Muhammadiya, also dated 209, possibly related to the simultaneous introduction of ¼ and ½ dirhams in San'a AH208-210, unpublished, VF, RRR.

Estimate: 200-300 USD