Hello Detlef, 
 
Thanks for posting your nice collection! I agree on all observations but believe we need to be careful with describing old Sumba blades as non-laminated: most likely they are laminated (low contrast and maybe limited welding) or at least likely to sport inserted edges... 
 
BTW, a very nice shield! A pic of the backside would be very kind. 
 
Regards, 
Kai
		 
		
		
		
		
		
		
		
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