I'm afraid I'm far from being a "master" of anything, but you're also far from being an ignorant, Fernando
This is extremely interesting. The original typology has already been discussed in the other thread, but the extent and the characteristics of this African production is a subject that deserves definitely a deeper study. The key element are the blades, probably. I would really like to be able to take a closer looks to some of them...
Thanks for this info, gentlemen.