I too wold suggest Russian made. 
 
The type was made by Zlatoust factory and I am sure others followed and copied the form too. 
Zlatoust manufactured pieces did not pin from the side on these types but used a peened tang construction. 
 
I hope others with more knowledge chime in. 
 
Gavin
		 
		
		
		
		
		
		
		
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