Watch List notes:

ISLAMIC, 'Abbasid Caliphate. al-Musta'in. AH 248-252 / AD 862-866. AR Dirham (25mm, 2.41 g, 12h). Citing Abu'l-'Abbas as heir. Surra man Ra'a mint. Dated AH 250 (AD 864/5). Album 234.2; ICV 391. VF, toned, some porosity. Rare.