An South American dagger, I guess Brazilian, I have seen 19th century Faca de Pontas like this, Mineira knife could be an other possibility.
See this threads:
http://www.vikingsword.com/vb/showth...azilian+dagger
http://www.vikingsword.com/vb/showth...azilian+dagger
The handle construction and the bolster are give aways for me.
Very nice knife.
Attached some 19th century Faca de Pontas from my collection.
From up to down: 32,4 cm, 39 cm, 32,5 cm, 18 cm
Regards,
Detlef