Bamboo / Rattan / Utility Knife from SE Asia?

[Lee]

Findings of interesting ethnographic artifacts at the local gun show continue to diminish and I am sad to report that almost all that I did see was third rate and once aimed at the tourist.

But one table did have this interesting old tool that I am interpreting as being a utility knife commonly used for working with bamboo or rattan for a price that I could not resist.

The overall length is about 21 inches with the blade being just under 9½ inches long. The blade is sharp along the straighter edge and tapers from about 3/8 inch thickness at its origin to about 1/16 inch just before the tip. The handle appears to be bamboo or rattan and is hollow centrally with a thick wall.

Decoration is limited to shallow annular carvings on the handle. I do not believe that this suggests a weapon, as handmade tools often have limited decoration.

I tried holding it as Ian suggested in post 19 of an early thread and it made really good sense as the arm muscles could clearly do the bulk of the work. These were also discussed in a more recent thread

Does anyone have any idea of a more specific area of origin?