Lords of Bukhara. AR Drachm. Bukhara mint, temp. Al-Mahdi (158-169 H / 775-785 AD). Obv. Crown bust to right; behind, 'al-Mahdi' in Kufic; before, 'Lord of Bukhara' in Sogdian. Rev. Sasanian fire altar, which is the outline of the divine head facing right, flanked by two attending priests (mabedh) standing facing each other. Album 94; Walker (Arab-Sassanian Coins) 319ff; Mitchiner 1550. VF.