Although these spears could be Samburu, I still believe Turkana is more likely (the similarity is due to the fact these are neighbouring tribes, as they are also with the Masai) It is the blade cover that convinces me of that 
Below are two links.....hover your cursor over the picture to magnify......notice the blade cover
http://anthro.amnh.org/anthropology/...F%208245%20ABC
http://anthro.amnh.org/anthropology/...F%208248%20ABC
  The Samburu version tends to have a narrower blade....
http://anthro.amnh.org/anthropology/...F%206180%20ABC
 Regards David