Watch List notes:

Abbasid, al-Mahdi AH 158-169 (AD 775-785) AR dirham (2.66 gm; 23 mm). Madinat al-Salam (Baghdad) mint. Dated AH 164 (AD 780). First part of Kalima in three lines across field; mint and date formula around / Continuation of Kalima and tasliya in three lines, citing al-khalifa al-mahdi below. Album 215.1. Slightly bent. Choice VF.