Watch List notes:

Abbasid, temp. al-Amin / al-Ma'mun, Dinar, 198h, 4.24g (SICA 3:200-201; A 220.7). Good very fine, rare.
It is impossible to definitively assign anonymous dinars of this type dated 198h to either al-Amin or al-Ma'mun.

Estimate: £300-400