There is a long ( and often pretty vicious) argument about the origins of shashka. The blade is relatively simple: early Circassian blades were  mostly European, very light, but later Daghestani ones could be quite heavy. 
 But the origin of the eared  guard-less handle is still a mystery. 
 My guess is  that it stems from the Turkish yataghan ( pure IMHO) 
 
If so, re-fitting Caucasian shashka with an Ottoman  crossguard might not have been such an unnatural idea for the owner and exiled Circassians  ( muhadjirs) seem to be a natural group for the mix of an old and the new traditions.
		 
		
		
		
		
		
		
		
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