This is an un-attributed Indo -sasanian coin struck during the period of the Pratihara - Pala supremacy and bearing Brahmi characters (ca. AD780 - 980). According to Mitchiner, these coins form a coherent series that was current in the Gujarat - Malwa region of the Gurjura Confederacy. The coins are more debased than those of the Pratihara series but, in general form, they diverged from early issues in that series. In this respect one can probably date the commencement of the series to the 8th century AD.
On your coin the Brahmi characters Sri Ha are shown in front of the bust. A similar piece is illustrated by Michael Mitchiner: Oriental coins and their values, Non-Islamic States & Western Colonies AD 600 - 1979. #358.