Watch List notes:

ABBASID OF YEMEN: al-Ma'mun, 813-833, AR ¼ dirham (0.46g), San'a, AH210, A-1050R, clear mint, date, and denomination rub' ("quarter") below the reverse field, clipped down to the damma standard of Sind, where this Yemeni coin was allegedly found! VF, RRR.

Estimate: 100-150 USD