Hello dear members,
thank you for your kind comments!

I for my part think that Rick is on the correct path. I think as well that it is a dha knife or short sword. For the origin I am unsure, it could come either from the Thai Tak province Mae Sot river region since the blade shape remember strong to the bird dha's (see picture) or from the bottom of Thailand at the border of Malaysia (Pattani region) but I think that the first region is the better guess since the blade shape is very similar. Any other thoughts?