Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Mahdi, AH 158-169 / AD 775-785. Dirham (Silver, 26.5 mm, 3.03 g, 3 h), Madinat Balkh, in northern Afghanistan, 169 AH = 785/6. Album 215. Exceptional condition. Good extremely fine.