Jens, I think we can make such a presumption, but the continuos sharpening is only a circumstantial evidence of a possible and probable change of hilt, not a conclussive one. We cannot infere automaticcaly one fron the other. But your point is very good, tough I think we can find relatively unused blades with the hilts changed all over the world. 
Regards 
 
Gonzalo
		 
		
		
		
		
		
		
		
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