Buwayhid, Mu’ayyid al-dawla Abu Mansur, Dirham, Isbahan 359h, citing ‘Adud al-dawla and Rukn al-dawla as overlords, with the signature of the die-engraver al-Hasan b. Muhammad in outer obv. margin, 5.05g/8h (Treadwell Is359; A 1554E; ICV 1590). Minor double-striking, otherwise good very fine, very rare £150-£180