Watch List notes:

ISLAMIC, 'Abbasid Caliphate. al-Musta'in. AH 248-252 / AD 862-866. AV Dinar (21.5mm, 4.19 g, 8h). Citing al-'Abbas as heir. Samarqand mint. Dated AH 250 (AD 864/5). AGC I 161Qe; Album 233.2; ICV 410. Near VF, slightly wavy flan. Rare.