British hilted sword with Indian(?) blade

[Nick Wardigo]

Is it possible that the bolster is there to tighten the fit of the blade in the scabbard and prevent rattling? This is the function of the Japanese habaki and Chinese tunkou. Ordinarily on a tulwar, the langets serve this same function by hugging either side of the scabbard. Since this weapon does not have langets, perhaps the bolster is there as a substitute.