Yes, Gavin is correct.  The work is all modern.   
 
Interestingly, there are period examples of these double swords, but the majority  are recent.  I have seen two antique examples, and both appeared to be from the late 19th early 20th c.  period.  They are copies of regulation duan dao, but they have a bit of a novelty feel to them and may have appealed to foreigners.  
 
Mine has what seems to be a recycled jian blade next to the longer, hefty, duan dao blade. 
 
The copy posted is trying to match the style and period of the originals but the workmanship is a tell tale. 
Josh
		 
		
		
		
		
		
		
		
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