Nice swords, these are one of my favorites, I started with two of those collecting african weapons.
These are mine, the 2 first ones are both signed by the "artist"

the second is also signed with a date, 1955. The tirth one is the oldest (late 19th century), see the size of the handle. I want some more of these, one with the copper nails like Tim's example and ofcourse a double one like Luc's one.

but with a small budget like mine it could thake a while
extract from EXECUTION KNIVES & DERIVATIVES (Tribal Arms Monographs Vol 1/N°2)
"It is notworthy that in early examples, dating before the twentieth century, the three spherical bulges on the handle below the grip were often smaller than in later knives..."