Wow. Thank you, Brian, for sharing these.
That first dha looks particularly nice. Is that gold set with jewels? Hard to tell much of the blade from the photos. I'll have more thoughts when I have some free time to look at this again.
The last sword you posted looks like a very fine version of the Vietnamese sabers presented by Philip Tom at Timonium this past March. However, I think this looks like a Thai sword. The decorative themes look Thai (I'm away from my sources, so I'm going on memory), as does the elephant. Is that, perhaps, a Thai royal seal? I'll check later tonight and see if I can find it.
Outstanding.