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					Originally Posted by  not2sharp
					 
				 
				I like it…. 
 
I suspect the key to this might be the handle pins.  I feel like I have seen similar screw fittings on some bayonets. 
 
N2s 
			
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 The closest match that I could find was on a Dutch 1873 Beaumont bayonet.  I wonder if that is the same nut used on your sword (installed upside down).