Ivan, I don't recall seeing any regulation-issue khukuris in the Indian Gorkha Regiments that had any markings on the blade - no arrows or anything else. I'm speaking of time-period from late 70s to early 90s when I was around dad's outfit. Another thing, I think by the 70s at least, Indian Army had pretty much stopped making anything with old British markings - didn't need to as most arms & equipment were about a generation ahead from the British days, or were sufficiently different to warrant making changes to old designs & markings.
John Powell seems to be right on the money with his explanation. Also, from your descriptions, the khukuri in question seems to be similar to those being sold by Atlanta Cutlery advertised as authentic Indian Army Gurkha issue with Ordnance papers or whatever. I have serious doubts about this - they just don't look like the ones I remember. Firstly, the AC ones, at least those shown on their website have brown wood handles, whereas most issue khukuris carried by Indian Gurkhas have black handles. Also, AC ones seem to be panna-butta types - don't remember seeing a Gurkha carry a panna-butta, at least not an issue khukuri. Lastly, AC khukuris seem to have a terrible reputation!
Hope that helps,
- Sonam
[This message has been edited by gtkguy (edited 28 April 1999).]