Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. Al-Mansur, AH 136-158 / AD 754-775. Fals (Bronze, 22 mm, 5.00 g, 7 h), Nishapur, AH 151 = AD 768. Rev. Countermark in the upper field to right reading: 'al-Amir al-Mahdi / akramah Allah' ('the Amir al-Mahdi, may God honor him' in Kufic). Album -. SICA II -. Stephen Album 20 (2014), 306. Of the highest rarity, perhaps the second known example. Slightly rough and with a minor edge crack, otherwise, very fine.