This is Tibetan in degree, as it clearly has Tibetan characteristics, but the three pronged pommel may be more associated with the swords believed to be of minority tribes inhabiting provinces of China NE of Tibet. (see the article on Tibetan swords written by Lee Jones on this site).
The three pronged feature on the pommel, and as noted in the article, suggests early 19th century, possibly earlier. The overall appearance of this dagger to me suggests 19th century, probably mid to late.
As always looking forward to comments from those more familiar with Tibetan weapons.
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