With regard to Kuba swords and knives ... the inlaid metal decorations to the wooden hilt are very finely done, usually in a greyish colour metal (sometimes in copper) ... I have wondered what type of metal it is - lead or zinc ?? 
 
Another observation - very similar work is to be found on some Acholi (Uganda) axes (images attached), but the Acholi are a long way from the Kuba. I wonder if this is just coincidence or is there another reason ?
		 
		
		
		
			
		
		
		
		
		
		
		
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