As I have said many times, it is difficult for me to date late pieces in good condition.  Nevertheless, because no one else has tried, I will say these are probably late Republican.  Many such blades copy earlier things, and may have artificial patination to make them look older.  Look for signs of real age, including a chipping or wearing away of any artificial patina.   
 
I see late examples to still be "real" if they have a good steel blade.  The pattern welded ones are obviously nice, but some mono-steel ones were also made with quality.   
Josh
		 
		
		
		
		
		
		
		
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