Knife Identification

[Nicknz]

I have attached a couple of photos of a knife I found amongst an uncles possession when he passed several years ago. I didn't know he had it so I was never able to ask him about where he got it from. He travelled widely over the course of his life and spent time in South Africa, India (managing a tea plantation) and Cambodia/Thailand. I have made inquiries over the years but have never been able to pin down the origin of the knife, although i think it is possible he acquired it when he he was in India. I understand the tea plantation he worked on was somewhere in the Assam area. The knife itself is quite plain, with no markings on it. It is about 38cm (14") in length and weighs about 40 grams (14ozs). The wooden sheath/scabbard is quite nicely made and secured with what appear to be copper rivets. I think it is just a daily working tool as opposed to anything special.
Any thoughts or information re it's possible place of origin would be much appreciated.