I've found a few pictures of daab/dha from the golden triangle area on commercial sword sites, these 'lotus' tip blades with the
exact same fullers and spine shapes and same length as mine, along with the more lengthy Burmese style hilts. I am satisfied the blade is from there, possibly Yunnan, where someone has tarted it up with the bits from a handy middle eastern writing case and a guard from something else handy. The Burmese and Thai swords made in this style were obviously mimicking the old Japanese Kogarasumaru (little crow) type sword from Japan,
See C0001 on Mar's excellent Dha research site at
http://dharesearch.bowditch.us/C0001.htm , even has pics of the same hollowed spine as mine. some of the sidebar details may be incorrect.