Watch List notes:

Abbasid, al-Mahdi, AH 158-169 (AD 775-785). AR dirham (2.90 gm; 25 mm). Basra mint. Dated AH 161 (777/778 AD), citing Muhammad b. Sulayman (governor of Basra, AH 160-164). Lowick 1030. Choice Good VF.