is this a common dagger?

[Conogre]

For whatever it's worth, on page 64, figure 54-1 of Spring's "African Arms and Armor", the top weapon shown is a dagger with a long, pointed blade and a snake guard.
It's not a match by any means, but it does show that the blade style isn't out of the question for a Dahomey origin.
Good luck....I like it.
Mike