Watch List notes:

ISLAMIC. Abbasid Caliphate. al-Mahdi. AH 158-169 (AD 775-785). AR dirham (2.84 gm; 23 mm). Anonymous type (The letter "M" is anonymous, but is most likely an initial for Mahdi [al-Mahdi]. It appears also on gold dirhams and bronze falus of al-Mahdi reign). Madinat al-Salam (Baghdad) mint. Dated AH 162. Album 215.1; ICV 379. Choice VF / EF.