Thanks for confirming that information Ed.  My next question is; what is the second number used for... It seems the six digit ECC already describes the vehicle and its attributes.  So how/why is the following one, two or three digit designation used?
		 
		
		
		
			
		
		
		
		
		
		
			
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				1953 M37 CDN 
 1953 M38A1 CDN 
1967 M38A1 CDN2
			 
		
		
		
		
		
	
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