David, traded or captured blade would be a possibility, but I'm wondering that such traditional people like the Tuareg could have done so.
The 'balance' of the sword is okay, not perfect but okay. But I believe it was more used for ceremonial purpose, not for fighting, because the edges are not sharp. The third Kaskara from the right have a very very similar blade, same size, same calligraphy, no sharp edges, same half moons on the blade. Only the Clauberg stamp is missing, mayby under the crossguard. I think is not special weighted, but not sure. The balance point is nearly 1/3 to 2/3, sure near to the handle, so I think it's okay.
Rick, attached our two marks. As you can see a little bit different. Unfortunately I couldn't find any of them in all my books. Maybe someone from the forum can help....
Best
Wolf
www.spearcollector.com