Funny how the universe works sometimes. Just about a week after learning of this type from flipping through
Imitations in Continuity I had the tremendous fortune of spotting not one, but two uber-rare Indo-Sassanian coins... so rare that even Dr. Maheshwari remarked on how difficult it was to find examples of the type for analysis.
This is one of the terminal branches of the Pratihara-Pala "Sri Ha" types. Despite being incredibly common, the Sri Ha drammas are an enigma, not attributable to a specific ruler, kingdom, area, or even century. From an initial standard of 4 grams of .025-.020 silver, the purity dipped down to .005 or less within the "standard" series, and after the collapse of their issuing authority (if there was one), a few types of local imitations sprung up, all with low to negligible silver content.
Except for my apparently unpublished imitation, this is the rarest of the late types, apparently first described in the 1990s, and only known from a handful of examples. The legend reads "Sri DaMa" in two lines, which could be an abbreviation for a name, a title, or even just a statement of value, e.g. "King's Drachm".
Besides the three letter legend, the telltale sign of this type is the reduced fire altar with only three flame dots.
For comparison, here is a standard Sri Ha type:

Sri DaMa coin 1, showing the legend

Sri DaMa coin 2, showing the bust and "Da"

Eye copy:
