Watch List notes:

ABBASID: al-Mahdi, 775-785, glass weight for one dinar (4.18g), ND, A-G216, cf. Balog-507/508, obverse legend bism Allah amara / al-mahdi muhammad / amir al-mu'minin / amta' Allah lahu / mithqal dinar / wâf, green, almost transparent, for the weight of the gold dinar, EF, RRR. Because of the obverse quality it is clear that there was no reverse inscription, though traces show that a worn-out mold was used for the reverse.

Estimate: 150-250 USD