ISLAMIC, 'Abbasid Caliphate. Al-Mahdi, AH 158-169 / AD 775-785. Dirham (Silver, 23 mm, 2.51 g, 4 h), citing al-Mahdi as 'al-Khalifa', Arminiya (Armenia), AH 162 = AH 778/9. SICA III, 322. Rare. Somewhat crystallized and with minor edge chipping, otherwise, good very fine.
From the Tabib Collection, formed over the past 40 years.