Watch List notes:

Abbasid, al-Muqtadir (295-320h), dirham, Madinat al-Salam 319h, rev., citing Amid al-dawla, 3.90g (Album 249 '320 only'), obverse weak and with hoard-staining, thus fair to fine; reverse with some encrustation at margin but generally very fine, extremely rare. The vizier 'Amid al-dawla was routinely cited on al-Muqtadir's coinage in the year 320h, but coins of the year 319h bearing his name are exceedingly rare. Album's Checklist records the type for 320h only.
Estimate: 300-400 GBP