I agree with Lew. This is an older seme from the Masai.
I once read somewhere that older seme always have a prominent middleribe. This is the case with your sword. Newer ones are often grind down from European machetes or just from a flat piece of metal.
The leather covered handle also shows some age, I think.
The size is right. My seme measures 51 cm, so that's about the same size.
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