Aging  steel blade is a piece of cake, they do it all the time.  
 You might be 100% right, but - no disrespect ! - I want to see the markings.  
One thing is already making my antennae twitch: no markings on the upper scabbard fitting.  
  
If I were the owner, I'd send good pics to a russian forum: some of these guys are incredibly knowledgeable and frightfully paranoid ( from daily exposure to bitter reality).
		 
		
		
		
		
		
		
		
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