ISLAMIC, Persia (Pre-Seljuq). Tahirids. Tahir I ibn al-Husayn. AH 205-207 / AD 821–822. AR Dirham (24mm, 2.89 g, 9h). Citing governor Ishaq bin Yahya and Tahir I as Dhu'l-Yaminayn. al-Muhammadiya (Rayy) mint. Dated AH 206 (AD 821/2). Lowick 1979; Album 1391A; ICV 1415. Lightly toned. VF. Rare.