Upon further consideration, I came to the conclusion that it shows the characteristics of a Deccan Bichwa... jut a bigger one.
So I would tend to lean towards Deccan origin.
But since there is little doubt that is an Indian sword, why calling it "Indo-Persian" when Indian would do?!
I noticed it has somehow became a fad calling all Indian or Persian weapons "Indo-Persian" even when is as clear as daylight they are either Indian or Persian.