Hello Charles,
I have followed this strange sword on e-bay also and have been sure that all is "original" old. When I see it now by your better pictures I am convinced by this opinion. I think that we only can guess how this Pira blade get this handle and sheath. Maybe break the handle and sheat and the owner give the blade this strange dress by what reason ever.
I personally like this sword, congrats for this nice addition to your collection.
Detlef