Hello Erik, 
 
I would call it Sewar, look for this inside the book from van Zonneveld. The blade of a Tumbok Lada is broader. I have also one with a crown at the handle and I think that these examples for higher ranking people. About the origin I can't say something. Here examples from my collection for comparison. 
 
Regards, 
 
Detlef
		 
		
		
		
			
		
		
		
		
		
		
		
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