'Abbasid Caliphate. Al-Musta'in, AH 248-252 / AD 862-866. Dinar (Gold, 19 mm, 2.94 g, 6 h), reduced standard, Sanʿa, AH 249 = AD 863/4. Citing his son al-ʿAbbas as heir apparent, ‘lā ilāha illā / Allāh waḥdahū / lā sharīka lahū / al-ʿAbbās ibn / amīr al-muʾminīn’ (‘There is no deity but Allah, the One, there is no partner to Him. al-ʿAbbas, son of the Commander of the Believers’ in Arabic); in the inner margin, ‘bism Allāh ḍuriba hādhā al-dīnār bi Ṣanʿā sana tisʿ wa arbaʿīn wa miʾatayn’ (‘In the name of Allah. This dinar was struck in Sanʿa in the year 249’ in Arabic); in the outer margin, traces of ‘li-llāh al-amr min qabl wa min baʿd wa yawmaʾidhin yafraḥu al-muʾminūn bi naṣr Allāh’ (‘To Allah belongs the command before and after, and on that day the believers will rejoice with the help of Allah’ in Arabic; Qurʾān 30: 4-5). Rev. ‘li-llāh / Muḥammad / rasūl / Allāh / al-Mustaʿīn billāh’ (‘For Allah. Muhammad is the messenger of Allah. al-Mustaʿin billah’ in Arabic); in the margin, traces of ‘Muḥammad rasūl Allāh arsalahū bi al-hudā wa dīn al-ḥaqq liyuẓhirahū ʿalā al-dīn kullih’ (‘Muhammad is the messenger of Allah. He sent him with guidance and the religion of truth, so that He may make it overcome all religions’ in Arabic). Album 1054. Rare. Some doubling on the obverse and a clipped edge, otherwise, extremely fine.