Welcome to KnifeForums. I think your question will probably get the most attention in the General forum, so I’ll move it there and also remove the duplicate from the Newbies forum.
Your dad’s bringback from Vietnam is a SoutheastAsian dha
. It could be a Montagnard dha
, or from some other nearby area such as Burma, Cambodia or Thailand. Unfortunately, the missing handle and scabbard are the parts that would have been most useful in pinning down a location of origin.
As you can see from looking at a large number of dhas
), the styles of mountings vary considerably. I am guessing that yours was originally fairly plain and simple in materials and workmanship.
The chance of finding someone in the US who has experience in making handles and scabbards is pretty slim. For display, you could simply cut a piece of bamboo to the length of the handle as best you remember it and attach it to the tang with wood filler. That should hold it well enough for display in a frame. As for the scabbard, making one is going to require some woodworking skills. The page I linked to has a number of examples.
I’ve seen similar markings on SEA blades before, but can’t locate any pics at the moment. Probably a combination of decorative and maker’s marks, significance unknown outside the local area.