While the maker of this blade is most likely from Yunnan
, the customer was probably some distance from the HuSa homeland. There are Achang living in northern Burma/Assam. These long-bladed, straight, square-ended dha/dao
are most commonly found in Assam and north-west Yunnan. The most common group in Yunnan to use this type pf sword are the Lisu (who are related ethnically to the Kachin). Scabbards are typically open-faced, and the toe projects well beyond the end of the blade.
You have found a nice example. The hilt looks to be Shan in style, and there is a close relationship between the Shan and Achang in south-western Yunnan.