You did well Ian, I remember this set being sold.
These knives are all authentic and used, some fairly late (post 1950s).
The left one is interesting, classic Holo (close to the Yaka), it's a circumcision knife, a similar one is figured in Felix, 1987. 100 peoples of Zaire and their sculpture.
Right one is Luba, known type of knife, but a late one though.
Mangbetu for n°3 seems correct. N°4 could be Songye by the deco on the blade.
These have nothing to do with those tourist pieces from Zanzibar shown above.
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