So it was you that got that  knife, first on the left from ebay recently  ,  I am going to have to keep my eyes peeled 

 .  What a very nice trio and I would agree with you that they are form the modern countries that are the west coast of Africa the former trade coast. These styles of knife seem to cover a vast area with  slight regional differences. The one I singled out is very much like Mandingo daggers. I think they look great.  Tim