Chris, 
 
I think the tassel is stylistically of the Hadendawa. However, I can't say that they were made exclusively in Kassala. Could have originated in other sword making areas of Eastern Sudan, primarily in Atbara. But I have seen high end Atbara swords with the harlequin silver handle and no tassel. Atbara sword makers would serve both a Nile Valley tribes as well as the Hadendawa market. All this said, I'd bet on it being from Kassala. 
 
Regards, 
Ed
		 
		
		
		
		
		
		
		
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