This eprey listing just finished....
http://cgi.ebay.co.uk/ws/eBayISAPI.d...=STRK:MEWAX:IT
Almost identical to my posted examples (thanks Tom for the 'heads up') Seller suggesting Sudan (or possibly Dogon) as origin. However, Tom also e-mailed some links to several pictures of Sudanese Arab Ox/horse riders with identically shaped spearheads (unfortunately too distant to see any features such as the triangular/conical feature) The horse riders are described as Aulad Hamid Arab horsemen, in the Anglo-Egyptian Sudan 1930
Mods..I have edited/altered the images...if there is any problem with copyright please delete
All the best
David