Good catch hombre. For "not very much" it seems this one has some age, and, if I'm reading the small plaque on the sheath correctly, this is silver marked "800"--in other words 80% silver (not silver plated). 
  
 Personally, I would clean it up but it does look nice too in its tarnished state.  
  
 Look forward to seeing more pics. 
  
 Ian
		 
		
		
		
		
		
		
		
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