The knife, called a “gile” or “jile”, is from Ethiopia (or neighboring Somailia or Eritrea). It’s used by the nomadic Afar (Danakil) people. They are herdsmen of cattle, sheep and goats, in one of the most hostile desert regions in the world.
Usually made from old truck springs or files.
Like all ethnographic weapons, there is no “Blue Book” value, with condition, age and quality of workmanship and materials all having a bearing. Specimens I’ve seen have sold in the $100 - $250 range.