Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Mahdi, AH 158-169 / AD 775-785. Dirham (Silver, 24 mm, 2 h), citing al-Mahdi as 'al-Khalifa', Kirman, AH 168 = AD 784/5. SICA III, 1169. In NGC encapsulation, graded MS63. A beautiful example, sharply struck and in an exceptional condition. Struck from a slightly corroded reverse die, otherwise, virtually as struck.