Watch List notes:

Umayyad of Spain, al-Hakam II (350-366h), ¼-Dinar, mint (Madinat al-Zahra) off flan, 35xh, citing 'Amir and Ja'far, 1.03g (cf Miles 250e; A -). Fine, extremely rare.
The unit of the date is visible but uncertain; full dinars of this type are known from the years 357-359h

Estimate: £300-400