ISLAMIC, 'Abbasid Caliphate. temp. Al-Mansur, AH 136-158 / AD 754-775. Dirham (Silver, 27 mm, 2.86 g, 5 h), Madinat al-Salam, AH 158 = AD 774/5. SICA III, 1598. Beautifully toned. Very fine.
From a Swiss collection of Umayyad and Abbasid coins, assembled in the 1970-1980s (with original flip with S. Album's description).