I have a yataghan  looking like Bulgarian karakulak, with Sarajevo-like "nuclear" decorations on the handle and integral bolster, dated 1838 ( NOT Islamic date!) 
 
 I think we may be talking about parallel development. If bladesmiths had a common idea of a blade, what prevented them to have a common idea of an integral bolster?
		 
		
		
		
		
		
		
		
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