'Abbasid Caliphate. temp. Al-Mansur. AH 136-158 / AD 754-775. Æ Fals (21.9mm, 3.13 g, 4h). Jibal al-Fidda mint. Dated AH 148 (AD 765/6). Struck in the name of the heir al-Mahdi. Cf. Stephen Album Rare Coins 37 (11 June 2020), lot 336 ('unpublished and probably unique'); Lowick -; Shamma -; Album A326 (this date not recorded). Fine. Extremely rare.