ISLAMIC, 'Abbasid Caliphate. al-Musta'in. AH 248-252 / AD 862-866. AR Dirham (26mm, 2.84 g, 1h). Citing Abu'l al-'Abbas as heir. Surra man Ra'a (Samarra) mint. Dated AH 250 (AD 864/5). Album 234.2; ICV 411. Near VF, toned, areas of flat strike at periphery, hairline flan crack.