Tim:
There is actually some information about these knives on the old forum. This thread has some useful discussion and a few pictures:
http://www.vikingsword.com/ubb/Forum1/HTML/001510.html
We decided, as I recall, that these knives came from the Afari people living in the Danekil Desert. Quite a fierce group.
Here are some pictures of one of mine that I posted previously in that thread. There is a story that goes with this knife (see the thread above).
Ian.