In my opinion this knife, more a karud than a khyber knife, had 3 stages in its life.
First it was a saber, most possibly of a shashka form. Unfortunately it was broken.
In the second stage, a very skilful master, reshaped it as a karud. The hilt looks to be the original.
In the final stage, this piece was in the hands of a poor man who used a piece of scrap metal to make a scabbard.
I have an 18th century fine Persian card in a scabbard made from an 20th century brass artillery shell! I like it a lot. In my eyes these items are more “original” because they have a story to tell.