ISLAMIC, Arabia. Rasulid. al-Mansur 'Umar I, AH 626-647 / AD 1229–1250. Dirham (Silver, 23 mm, 1.87 g, 12 h), type D, Zabid, AH 641 = AD 1243/4. Within double intersecting trefoils, ‘lā ilāha illā / Allāh Muḥammad rasū/l Allāh’ (‘There is no deity but Allah. Muhammad is the messenger of Allah’ in Arabic); in the margin, ‘al-aʾimma Abūbakr al-ṣiddīq ʿUmar al-fārūq ʿUthmān dhū al-nūrayn ʿAlī Abu’l-Sibṭayn’ (‘The Imams, Abubakr the Upright, ʿUmar the Distinguisher between Truth and Falsehood, ʿUthman the Possessor of Two Lights, ʿAli the Father of the Two Grandsons [of Muhammad]’ in Arabic). Rev. Within double intersecting trefoils, citing the ʿAbbasid caliph al-Mustaʿsim billah (AH 640-656 / AD 1242-1258) ‘al-Mustaʿṣim / billāh amīr al-muʾminīn / al-Manṣūr ʿUmar’ (‘al-Mustaʿsim billah, Commander of the Believers. al-Mansur ʿUmar’ in Arabic); continued in the margin, ‘al-malik ibn ʿAlī al-yamānī khallada Allāh mulkahū ḍuriba bi Zabīd sana aḥad arbaʿīn sitta miʾa’ (‘the king, son of Ali, the Yamani, May Allah perpetuate his kingdom. Struck in Zabid in the year 641’ in Arabic). Album 1100.4. Well struck and nicely toned. Minor deposits, otherwise, very fine.