Thank you Anandalal for what I believe to be the correct ID of the folder I posted a pic of in post #4. 
 
I obtained this knife from an importer of hand woven carpets, and it was he who suggested that it was in fact a carpet maker's knife. 
 
Perhaps it was, but probably not used for making carpets. 
 
Your explanation makes perfect sense. 
 
Again, my thanks.
		 
		
		
		
		
		
		
		
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