Watch List notes:

'Alids of Tabaristan, dirham, citing the caliph al-Mahdi (158-169h), 1.94g (Album W1523), good very fine and very rare. Ex Peus auction 392, May 2007, lot 4886. This type is much more commonly encountered naming the later caliph al-Rashid (Album Z1523).
(300-400 GBP)