Hi Ian:
Welcome to the Forum. We can't have too many Ians!
I think you have an older example of the Moghul tulwar hilt with some transitional features between the Hindu basket hilt an the later tulwar form with the straight guard. I'm unsure whether one can say this is more likely to be southern or northern Indian in origin, although the sharply pointed central area of the handle is a feature that has been attributed to the Punjab.
This sword appears to have some considerable age but a picture of the complete sword would be helpful.
Ian.