Khyber knife

[rgremm]

Hello Everyone,
I picked up this knife in Kabul in the winter of 1970/71 at a shop catering to westerners. I know absolutely nothing about its origins or provenance. This bit of research is something I've wanted to do for a very long time and I'm hoping some of you may be able to offer some direction. It has the basic shape of what is called a Khyber knife and I acquired it not far from the pass and Pashtun territory. However it has some unusual features, the most enigmatic of which is the manufacturer or artisan's mark in the ricasso (also an unusual feature on knives from that area). The engraved silver work seems to imply ceremonial use but the blade is all business. It may be a tribal artifact but I've always thought it may be some sort of regimental issue from a unit associated with the area. The battered sheath provides a very secure friction fit. I have no idea why the tip was rolled up. Aside from polishing the silver and oiling the blade I've left everything as is. Thanks for any assistance you can render on this.
Rick Gremm