ISLAMIC, 'Abbasid Caliphate. Al-Musta'sim, AH 640-656 / AD 1242-1258. Dirham (Silver, 25 mm, 2.90 g), Madinat al-Salam, AH 641 = 1243/4. Within an octofoil, ‘lā ilāha illā / Allāh Muḥammad / rasūl Allāh’ (‘There is no deity but Allah. Muhammad is the messenger of Allah’ in Arabic); in the margin, ‘bism Allāh ḍuriba hādhā al-dirham bi Madīnat al-Salām sana iḥdā wa arbaʿīn wa sitta miʾa’ (‘In the name of Allah. This dirham was struck in Madinat al-Salam in the year 641’ in Arabic). Rev. Within an octofoil, ‘al-Imām / al-Mustaʿṣim / billāh amīr / al-muʾminīn’ (‘Imam al-Mustaʿsim billah, Commander of the Believers’ in Arabic); in the margin: ‘naṣr min Allāh wa fatḥ qarīb wa bashshir al-muʾminīn’ (‘Help is from Allah and an immediate victory; and give good tidings to the believers’ in Arabic; Qurʾān 61: 13). Album 276. Interestingly, the name of the caliph was defaced from this reverse die. Areas of weakness, otherwise, good very fine.