Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Mahdi, AH 158-169 / AD 775-785. Fals (Bronze, 18 mm, 2.65 g, 2 h), citing the caliph al-Mahdi and with 'Rabi' ('my Lord' in Kufic) on the revers, Istakhr, AH 167 = AD 783/4. SICA II, 1402. Slightly rough, otherwise, very fine.