Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. Al-Mahdi, AH 158-169 / AD 775-785. Dinar (Gold, 19 mm, 3.92 g, 6 h), without mint name, AH 164 = AH 780/1. Bernardi 51. Slightly clipped and with light scratches, otherwise, about very fine.