Watch List notes:

'Abbasid Caliphate. Al-Mahdi. AH 158-169 / AD 775-785. AR Dirham (25mm, 2.96 g, 5h). Harunabad (in margin) / Arminiya (in reverse field) mint. Dated AH 169 (AD 785/6). Citing the heir Harun and local official Hasan. Vardanyan 187; Lowick 866; Bonner 2. Obverse staining. Good Fine.