Hi Katana,
What you have, is a nice old classic khanda, which I would place in Rajasthan – congratulations

. The hilt is nice, and as Spiral writes a bit unusual, the change of the spike to a flower but can be seen now and again, but please tell us about the blade, is it flexible? I think it would be, but I am not sure. How much you will clean it depends on your temperament, some remove the worse rust and make sure it wont rust any further, while others, like me, go a bit further, to make it show more of the original weapon, although I would never remove all the rust to get a shiny khanda. Let us know how the work proceeds.