Watch List notes:

Abbasid Caliphate. al-Ma'mun. 194-218/810-833. AV dinar (17 mm, 3.79 g, 9 h). Misr, A.H. 210 (815). With his name, and citing the governor 'Ubayd b. al-Sari. Album 222.9. Scarce. Old scratch on obverse, die shift. Very fine.