It seems to me that the paper written by Nathan Robinson on the 'My Armoury'   site is very informative discussing the evolution of these schiavona . It seems that the style itself evolved from Hungarian swords with similar pommel and simple S guard, and eventually added bars with the trellis in Croatian areas.  
"Cut and Thrust Weapons" by Eduard Wagner has some cursory detail and drawings.
		 
		
		
		
		
		
		
		
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