Hi Freddy,
I think it's a recent Marghi knife made for dance, in the good tradition of african recycling metal .
Here is one on my website
http://lulef.free.fr/html/tk_kirdi_3.html
and another I've just put on ebay
http://cgi.befr.ebay.be/Couteau-de-j...QQcmdZViewItem
Luc