I'm again here) 
 
Jim, I'm very grateful for your very detailed and informative answer! 
At one of Russian forums I've already heard that this is probably a Cossack's sword/saber. And interestingly enough, that this sword came to me from the Ukraine) 
 
I forgot to specify at the beginning, that the pommel (drop-shaped top) is still remained. 
 
I do not support reckless "restoration", so I'll try to be very gentle)
		 
		
		
		
		
		
		
		
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