In looking at this interesting example, I tend to agree with Tom in that the hilt appears to be more in line with tulwar hilts. While the unusual spooned blade tip does resemble those typically seen on examples of 'pattisa' as Ariel has suggested, this blade also does seem single edged.
Pant (p.65-66) notes that the pattisa blades are double edged, with the pattisa's being quite flexible and the seatings are typically longer than the khanda. It should be noted that the original khandas had very similar hilts to this form and that both khanda and pattisa were originally from S. central India.
I am inclined to think that this example is from the northern regions, most likely Rajasthan. It is noted that khanda/pattisa hybrids are known, which is not at all surprising with the broad diffusion of weapons in the Indian subcontinent. This very diffusion took the khanda to the north where as noted it did become a religious icon to the Sikhs, in the more well known form with the so called 'Hindu basket hilt'. The actual worship of the khanda was also well known by the Rajputs, who prevailed in Rajasthan regions, and the trisula was key in symbolism to Shiva.
Without going further into the complexities and similarities in Rajput and Sikh dogma, I am simply noting the trisula as it appears on the blade of this example. As far as I am aware, and in discussions with Sikhs asking about such symbolism, I have been told there are not distinctive symbols that are found on Sikh blades that would designate them as such.
However, in "Annals and Antiquities of Rajasthan' by Lt. Col. James Tod, 1829, there is a geometric device representing a lance which is the sign of a prince or chieftain from a principality in Mewar (Rajasthan) which seems to correspond with the trident seen on this example in stylized form (p.164).
This suggests as well that this sword may well be from these regions, in addition to the unreinforced hilt of tulwar form. The cartouche which seems to be a makers stamp is also placed in the quadrant of the blade root where similar stamps are found in many early tulwar blades from these regions, the inscriptions often in Urdu.
It would be difficult to concisely classify this sword into a single category by term, but best described as probably Rajput khanda with traditional form hilt and pattisa type blade. I guess it would be a matter of opinion
since the hilt is closer to tulwar form than the old khanda, and the blade itself doesnt really conform to the description of the pattisa blades except in the widened tip.
Best regards,
Jim