Martin,
Lovely dagger. The engraving seems similar to the engraving on the blade of a sword sized Tebu dagger I posted here:
http://vikingsword.com/vb/showthread...highlight=tebu
It is also similar to a ceremonial spearhead Tim posted:
http://vikingsword.com/vb/showthread...highlight=tebu
And finally, you can see the same triangular motif on some of the dagger blades in this thread, including the one published by the Frankfurt Etnographic Art Museum in 1985:
http://vikingsword.com/vb/showthread...highlight=tebu
Iain wrote essays in the past about our futile and probably flat out incorrect approach of attempting to a attribute every single weapon from these regions to a particular tribe. In reality, it appears that styles and forms mixed a lot, and it is often hard to even determine whether a weapon originated in a Muslim or Animist group, let alone determine with precise accuracy what it Tebu, Fulani, Kanuri or Matakam. This dagger seems to illustrate Iain's point.
Regards,
Teodor