Watch List notes:

FATIMID: al-Mahdi, 909-934, AR ½ dirham (0.76g) (al-Qayra)wân, DM, A-690var, Nicol-134 (type E), the Imam cited only as amir al-mu'minin below the obverse and al-mahdi billah below the reverse, with no additional names or titles; clipped down from the normal ½ dinar weight of about 1.5g, perhaps for use as a quarter dirham, Fine, RRR.

Estimate: 130-170 USD