Miguel: 
 
Sorry to come to this one late. I recently returned from overseas and a bit jet lagged. 
 
IMO Detlef has correctly identified the age of this one as around 1900 or a little earlier. The low quality blades were common, and they were essentially parade swords--for show rather than combat.  
 
Surprisingly they are not all that rare given the history you noted. I think some that were confiscated were tucked away as "souvenirs" or sold off to foreigners. I have not seen any in my trips to Vietnam, but rather they seem to come up in European auctions and online from western dealers. 
 
Ian.
		 
		
		
		
		
		
		
		
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