Watch List notes:

ABBASID: al-Mahdi, 775-785, AR dirham (2.92g), Sijistan, AH165, A-215.1, Lowick-571, with the town name hajar below the reverse field, superb quality for this mint, EF to About Unc, R. Al-Yamama is the only mint in what is now Saudi Arabia that produced coinage during the early Abbasid period.

Estimate: 500-700 USD