ISLAMIC, 'Abbasid Caliphate. al-Mahdi. AH 158-169 / AD 775-785. AR Dirhem (28mm, 2.58 g, 8h). Bukharkhuda type. Bukhara mint. Struck circa AH 158-168 / AD 774-785. Crowned bust right; al-mahdi to upper left / Fire altar with ribbon and crowned bust right in flames, flanked by two attendants. Treadwell, Monetary, Type 3; Walker 319-37; Album 94. VF, areas of toning, a couple of tiny flan splits.