'Abbasid Caliphate. temp. Al-Mahdi. AH 158-169 / AD 775-785. Yahya b. Mikhnaq. AH 162-165 / AD 779-781. AR Hemidrachm (25mm, 1.95g, 5h). Tabaristan mint. Dated PYE 130 = AH 165 / AD 781/2. Obverse: Name of governor before bust. Reverse: Star to left and right of flames. Malek 89.8; Album 60 RR. Choice EF. Rare.