This is one of those cases where these are typically IDed as Tuareg, but I would probably term it a "Western Sahel" style knife. Knives of this form are found over a wide area, it may well be Tuareg, it may well have been used by someone from a different group. This appears to be a 20th century piece from the photos but has a good stout blade. A nice find particularly if it was cheap.
