It's a
Bull and Horseman jital, made by many kingdoms for many centuries before, during, and a little after the
Islamic conquest of most of
India. The only dedicated resource is "Jitals" by
Robert Tye; he has made the plates free to download for easy reference.
I don't see enough of a
legend to allow an
attribution beyond "late anonymous
type". Not sure of silver purity, but genuine examples are worth only a couple dollars, so I don't doubt its authenticity. They are very common coins!
Here is the prototype:
