ISLAMIC, Persia (Pre-Seljuq). Bavandids of Tabaristan. Shahriyar ibn Rustam. Circa AH 377-393 / AD 987-1003. BI Dirham (25mm, 5.73 g, 10h). Citing the Buwayhid Fakhr al-Dawla as overlord. Firrim mint. Date not visible. Album 1525.1 ICV 1684. Near VF, darkly toned, areas of flat strike, green deposits. Very rare.