Swords are not my area, but there’s a lot going on with that tang area. 
 
Whatever construction type it was, the crossguard and/or basket/cup was multi-piece construction as a more typical crossguard with a central hole won’t slide on and get in that groove. 
 
I’m not currently able to find anything of similar construction type.
		 
		
		
		
		
		
		
		
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