Hi David, 
 
I tend to agree with Fernando in that you haven't missed out on much. It appears to be a low grade 20th century, possibly French navaja in a sorry state of disrepair. 
 
I have my own share of such junk knives, which I buy to complete the story of the navaja. As such they have their place in a comprehensive collection, but as stand alones they have little value.  
 
Cheers 
Chris
		 
		
		
		
		
		
		
		
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