It's a seme from the Masai  (or a nearby tribe) of East Africa.  It's probably relatively old--it looks like it has a midrib and a diamond cross-section which (I believe) is an older feature.  The newer ones are basically flat, built like machetes.  I don't recall the date when the switch-over happened, but by old, I mean that it's likely mid 20th Century, at a guess. 
 
Neat blade--and I'm sure the next poster on this list will have a better guess on its age. 
 
Fearn
		 
		
		
		
		
		
		
		
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