Very nice!
Your coin is part of the "Indo-sassanian" family tree; native creations modeled on Hunnic copies of drachms of Sassanian emperor Peroz I.
This type in particular is part of the "Sri Ha" family, attributed roughly to the Pratiharas, c. 600-800. They are poorly understood, woefully under-studied, and the handful of references out there are flatly contradictory and often misinformed and misleading.
Currently, the best reference out there is Maheshwari's "Imitations in Continuity". He argues that these are derivatives of a much more common type, although I argue the opposite. This type is reasonably scarce, and comes in a handful of legend types: Sri Ha, Sri Va, Sri Te, Sri DaMa and Sri Bho, off the top of my head. Rarely, some will have no legend, or a little flower in front of the bust. Yours I believe is Sri Ha. The legends are a complete enigma, and nobody has been able to attribute them to a ruler from any kingdom.
I have a handful of these coins, I believe mostly Sri Va types. I do have one image handy, although I sold this coin a year ago:

Here's the intermediate coin into the Sri Ha type:


Here is a more standard Sri Ha:
