Agree.
			 
			 
			
		
		
		
			
			You are correct.  Those bars and colors of the basic "blazon" are always present.  The shield shape changed over time with the general practice of the heralds.   
 
The following well-known book shows an earlier shield type that matches the shield shape on the hackbut.  The book states that this earlier shape which I call the "coffee cup" was used only from 1470-1525, as I recall on page 72 or nearby.   
 
Author: Ottfried Neubecker 
Title: "Heraldry; Sources, Symbols, and Meaning" 
Price: US$ 4.06 
Book Description: 288 pp., folding plate, hardcover, very good in a very good dust jacket
		 
		
		
		
		
		
		
		
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