ALID OF TABARISTAN: al-Mahdi al-Haqq, ca. 780s-790s, AR dirham (1.82g), NM, ND, A-W1523, the "al-Mahdi" on this coin is likely the Abbasid caliph by that name (775-785), with parts of the Qur'an Verses 42:23 and 17:81 replacing the date & mint in the obverse margin, VF, RR.
Estimate: 100-150 USD