ISLAMIC, Persia (Pre-Seljuq). Buwayhids (Buyids). Baha' al-Dawla Abu Nasr Firuz Kharshah. AH 379-403 / AD 989-1012. AR Dirham (27mm, 2.90 g, 12h). Arrajan mint. Dated AH 390 (AD 999/1000). Treadwell AR390 var. ('ayn above beginning of Kalima); Album 1574; ICV 1615. VF, toned, a couple of flan cracks, flan crimped at edge. Rare.