'Abbasid Caliphate. Al-Mahdi. AH 158-169 / AD 775-785. AR Dirham (24.8mm, 2.85 g, 11h). Qasr al-Salam mint. Dated AH 168 (AD 784/5). Lowick 1474; SCC 957; SICA 3, 1153. VF. Rare.
The short-lived mint of Qasr al-Salam was only operational for three years under al-Mahdi. Dirhams were struck there in the years AH 167, 168, and 169.