Watch List notes:

Tahirid, Tahir b. al-Husayn, Dirham, al-Muhammadiya 206h, citing Muhammad b. Humayd, rev. al-imam al-ma'mun / muhammad / rasul / allah / dhu'l-yaminayn, 2.95g (NHR 108A; SCC 1190; A 1391). Very fine, rare.

Estimate: £150-180