Here are the last three things left to translate. 
 
1: The maker's mark. 
2: The diamond shape symbol made with 9 dots. 
3: The "xxx" or ">>>" symbol. 
 
If these can be figured out I suspect that will help put an accurate date on the blade.  I suspect there is only a limited slot in the timeline where all the symbols on this blade would of been used together.
		 
		
		
		
			
		
		
		
		
		
		
		
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