Watch List notes:

ISLAMIC, 'Abbasid Caliphate. temp. al-Ma'mun. AH 199-218 / AD 813-833. AR Dirham (26mm, 3.08 g, 3h). Citing Muhammad ibn Bayhas. Dimashq (Damascus) mint. Dated AH 208 (AD 823/4). Album 223.8a; ICV 390. VF, toned, die breaks on reverse, wavy flan. Very rare.