Watch List notes:

ABBASID: al-Mahdi Muhammad, 775-785, AE fals (2.52g), al-Yamama, AH167, A-313Y, with the citing name Hajar below the reverse field, as on the silver dirhams of al-Yamama; the only Abbasid mint that operated in what is now Saudi Arabia, Fine, RRRR. A total of 4 examples, including this piece, are now listed between Zeno & CoinArchives. This is the only example that shows the complete date & mint.

Estimate: 700-900 USD