Watch List notes:

TAHIRID: Tahir II, 845-862, AE fals (4.18g), al-Shash, AH240, A-B1395.2, Zeno-36651 (this piece), citing both Tahir and the governor Yahya along with mint & date in the obverse margin, plus the caliph al-Mutawakkil beneath the reverse and the caliphate heir-apparent Abu 'Abd Allah beneath the obverse field, fabulous specimen, bold EF, RRR. The year 240 is much rarer than the relatively common 241.

Estimate: 120-160 USD