Knife for I.D. Chinese? Tibetan? Bhutanese?

[Jerseyman]

I acquired this item earlier this year. I assumed it was Tibetan Plateau though I couldn't find any images of this exact type. It seems to be stylistically related to Norman's piece, so I thought it worth posting. Unfortunately I don't have the measurements to hand - if I have time to dig it out I'll post them. If anyone has any information on the cultural context, or even better any sources referencing these I would be grateful to hear.