Agree with Tatiana: the script is definitely not Cyrillic. 
 There is an eagle on the blade, looking suspiciously like the USA. The inscription confirms it: "E pluribus unum".   In short- USA blade, 19-20 century. Who reworked it, and in what style, is a separate question. 
  The quillon on one side looks somewhat "nabour-ish", isn't it?
		 
		
		
		
		
		
		
		
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