Tahirids. Tahir I b. al-Husayn. AH 205-207 / AD 821–822. AR Dirham (26.4mm, 2.99 g, 3h). Madinat Harat mint. Dated AH 206 (AD 821/2). Citing the local governor al-Shukr b. Ibrahim (obverse field) and Tahir I as Dhu'l-Yaminayn (reverse field). Wilkes, Coinage 13; Album 1391A. Good VF.