Hello Zelmoxis, 
 
You sound very certain that this is Vietnamese and not Chinese.  Do you know how to tell the two apart?  Are you using a source other than the Barbier-Mueller book or the Huard and Durand book? 
 
Honestly, up until now, I had thought the two shield designs to be identical.  But, if you can distinguish them by weaving pattern or some other way, I REALLY want to know.  I collect Vietnamese arms myself, and such information would be invaluable to me. 
 
Just to give you an idea of my problem, I'm attaching a line drawing from the Chinese military manual, LIEN PING SHIH CHI, written and illustrated in 1571 (and reproduced in Osprey Military's, MEN-AT-ARMS SERIES, LATE IMPERIAL CHINESE ARMIES, 1520-1840).  As you can see, it looks just like Bill's shield, or for that matter, any other large, round rattan shield. 
 
Anyway, I hope you can help.
		 
		
		
		
			
		
		
		
		
		
		
		
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