Watch List notes:

ABBASID, Al Mahdi (Mehdi). (reign: 775-785 AD). Æ Folus (2.52 gm; 16 mm). 3rd Abbasid Khalif. Ray? mint, Year 166 AH. Obverse: al-Khalifah al Mahdi, Amir almo'menin, Rabi' (Lord), year 166 AH. mint: Ray? (Mohamadyeh). Extremely rare design on the reverse. Brown reddish patina. Choice VF.