This is purely speculation, but could it simply be an Ottoman (Egyptian or Hejaz) shamshir that has found its way south and has been 'sudanised' to local taste. 
I would really like to know what is under that bulbous brass encased hilt. Is there any way of finding out? 
It could be a pleasant surprise. 
Regards 
Richard
		 
		
		
		
		
		
		
		
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