Coin, Abbasid Caliphate, al-Mahdi, Dirham, Baghdad, VF(30-35), Silver. Abbasid Caliphate, al-Mahdi (AH 158-169/775-785 AD), Dirham, Baghdad (Madinat al-Salam). As part of our procedures to fight against the trafficking of cultural goods, the provenance of this item has been rigorously verified.