Hello. thank you Fernando 
Yes, sometimes... 
That's why I asked if someone already saw this one : 
 
It can be a militar common monogram like the Prussian swords with Wilhelm II empereror monogram on the hilt(1) 
 
Or rare like the russian  hussars impérial guard monogram(2) 
 
Or a personal-single nobleman monogram (3)
		 
		
		
		
			
		
		
		
		
		
		
		
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