ISLAMIC, 'Abbasid Caliphate. temp. Al-Mahdi, AH 158-169 / AD 775-785. Hemidrachm (Silver, 23 mm, 2.00 g, 10 h), anonymous type, Tabaristan, PYE 133 = AH 168 = AD 784/5. Crowned and draped Sasanian-style bust to right; behind head, GDH ('kingship' in Pahlawi); before head, 'AFZUT' ('may increase' in Pahlawi); in outer margin, APD / NWKW ('excellent' and 'good' in Pahlawi). Rev. Sasanian fire altar set on three steps, flanked by two attendants standing facing; to left, date; to right, mint TPURSTAN ('Tabaristan' in Pahlawi). Album 73. SICA I, 423. Walker, Arab-Sassanian, 306. Minor marks, otherwise, good extremely fine.