Never heard of Gasawiden. There are the Ghaznavids from Afghanistan. Structure of your specimen looks more like the tiny coins of the Amirs of Sindh. What is the size and weight ?
Yes, Ghaznavids, Bahramshah, citing Seljuk overlord 'Adud al-Dawla Sanjar and the 'Abbasid caliph al-Mustarshid. https://www.zeno.ru/showphoto.php?photo=243347