Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. Al-Mahdi, AH 158-169 / AD 775-785. Dirham (Silver, 25 mm, 2.74 g, 7 h), al-Abbasiya, AH 167 = AD 783/4. SICA III, 1051. Lightly toned. Some doubling on the reverse, otherwise, very fine.