most of the spears from Kenia that I have owned and seen would have no problem to be used as a functional spear, their metal is forged not welded but the reality is that , aside from the millions of spears produced in the past for local consumption the same artisans work every day and pretty much in the same way to produce spears for the tourists.
see how the exact same spear identified as a Samburu spear is made ( around 1':00" you see the spear
https://www.youtube.com/watch?v=-JZ6gXS14Uc
more
https://www.youtube.com/watch?v=tFttPhAYpn0
https://www.youtube.com/watch?v=OM5z_9rPI_o