Sajen,
Here are two knives that I found with similar blade profiles, but neither is identical to yours as yours has a more straight spine. These were my reasons for first suggesting a Sumatran origin to the knife that is the subject at hand, and then wondering if it may be Thai.
The top one here is Sumatran and the bottom one Thai or Burmese.
The blade profile of the bottom one is slightly closer to yours.
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