A small note on sliding nasal bars. Many could be worn with the bulbous part at the top, then inverted to provide more facial coverage before entering battle.  
 
I suspect the OP's nasal was, in use, a bit straighter & bent later in life. It may be possible to rotate it if the wing screw is removed so the small protruding stud at the base will fit through, acting as a grip when down, and a stop to keep it from falling out when up. I also suppose that the missing rivet holes may have  been for attaching a liner and or aventail of sorts.
		 
		
		
		
			
		
		
		
		
		
		
		
		
			
				  
				
					
						Last edited by kronckew; 11th October 2020 at 06:27 PM.
					
					
				
			
		
		
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