Gunjack;
Top of the morning to you sir, I hope that this second last Sunday of the first month of 2020 finds you well, warm and dry.
With the understanding that I am basing my answer off of looking at your photos and an increasingly foggy memory, I would offer the following thoughts.
When we were in rural Kenya in 1975 we saw similar spear heads and complete spears with shafts for sale in the local market place. I want to say we also saw some in a couple of the shops in Nairobi as well - again though 1975 was a couple days ago and there's been a couple lifetimes in between so I can't be certain of that.
Anyway I don't recall that anything was what we considered "expensive" at that time in Kenya - other than factory ammunition - which was all one was able to possess by the way - but that's another tangent for another day.
For reasons that escape me at this juncture, I didn't pick up a spear head when I was there and upon returning home to the Saskatchewan prairies, immediately regretted it.
When a couple family members went of an extended tour of Europe, the Middle East and Africa a couple years after that and asked what I'd like them to bring me home I suggested a spear head from east Africa.
They returned with not one, but 2 different spear heads for me, one which looks very much like yours and one a barbed unit which I've tried spearing carp with and believe it's for fishing.
Oh, lastly when we were on the Masai Mara hunting near the Rift Valley in Kenya, we bumped into a young Masai chap herding cattle and he carried a spear which to my untrained eye looked absolutely identical to the one I now own and the one in your photos. He was, we were assured by the local who was guiding us - ready, willing and able to kill whatever was pestering his cattle with it.
Personally I'd have preferred the Model 70 in .458 Win Mag which the chap we were with had and although we didn't see any lions, we did absolutely hear them every night through the tent walls.
It's interesting how some things blur with time and how some things stick with you. As I look out the window at the deep snow in our southern BC yard, I can still hear that hoarse sawing growl of the lion in the Kenyan night.
Thanks kindly for the walk down memory lane this morning sir and letting me share it.
As far as the value of your spear, I can't begin to guess - sorry. My spears aren't for sale since to this semi-old guy they're priceless. They are magically able to take me back 45 years into a place and time that I'd imagine is as vanished as the rural Saskatchewan of my youth.
All the best to you and yours sir.
Dwayne