Watch List notes:

ISLAMIC, 'Abbasid Caliphate. Al-Mu'tamid, AH 256-279 / AD 870-892. Dinar (Gold, 20 mm, 2.78 g, 5 h), reduced weight. Citing the caliph al-Mu'tamid billah, the caliph's brother al-Muwaffaq billah and the minister Sa'id ibn Makhlad as Dhu'l Riyasatayn (holder of the two ministries), San'a, AH 270 = AD 815/6. Bernardi 178El. Rare. Struck from a somewhat corroded obverse die and with a rough spot on the reverse, otherwise, very fine.