ww2 british chindit machete....locally made in SEA??

[katana]

Hi,
bought this army issue machete, used extensively in SEA 'operations' during the last war.... I believe that this were locally made for the Army.
The 'slabbed' handle is of a unkown hardwood , The blade is thick, carbon steel approx 6mm thick and heavily pitted. A nice weighted feel to it.
The handle has a diamond 'stamp' with '131' and on the other side a rectangle with '437'.

OAL 19"
Blade 14"
Tip width approx. 2"

The 'squared off' tip, could possibily indicate the country or area of origin. I am wondering 'Burma' or thereabouts due to the style and the heavy British involvement in Burma during WW2.

As usual ....any information or comments greatly welcome....thankyou

Regards David