You have located the date correctly. I read it as 326: sitt wa 'ashrin wa thelath mi'at. The mint is Shiraz. It's an issue of the Buyids/ Buwayhids. The ruler 'Imad al-Dawla Abu'l-Hasan 'Ali is cited as 'Ali bin Buwayh, last line of central inscription, 2nd photo. Album 1538. According to Album, the additional marginal legends bear "auspicious formulae".
https://www.zeno.ru/showphoto.php?photo=236190
https://www.zeno.ru/showphoto.php?photo=236190






















