ISLAMIC, 'Abbasid Caliphate. temp. Al-Mansur, AH 136-158 / AD 754-775. Seal (Lead, 23 mm, 5.01 g, 12 h), AH 155 = AD 771/2. In the centre, citing governor(?) Aḥmad ibn Ibrāhīm (in Arabic); around, citing the Caliph’s son and heir Abu ʿAbd Allah Muhammad, ‘li-ʿabd Allāh Abī ʿAbd Allāh [Muḥammad] ibn amīr al-muʾminīn’ (‘For the servant of Allah, Abu ʿAbd Allah Muhammad, son of the Commander of the Believers’. Rev. In the centre, ‘arbaʿa wa ʿishr/īn’ (‘24’ in Arabic); around, ‘sana khams wa khamsīn wa miʾa’ (‘year 155’ in Arabic). Album. Partially broken and with some deposits, otherwise, very fine.