Watch List notes:

ABBASID: al-Mahdi, 775-785, AR dirham (2.58g), al-Yamama, AH167, A-215.1, with triplet of pellets above and the town name hajar below the reverse field, some light porosity, still very attractive, VF. Al-Yamama was the first mint in Arabia to strike silver coins, located near the modern city of Riyadh, with its administrative capital at the town of Hajar. It operated AH165-170.

Estimate: 260-325 USD