Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Musta'in, AH 248-252 / AD 862-866. Dirham (Silver, 24 mm, 3.10 g, 12 h), citing al-Musta'in bi-llah, Madinat al-Salam, AH 251 = AD 865/6. SICA IV, 918. Very rare. Minor areas of weakness, otherwise, good very fine.