Rob & David:  thanks for the additional info.  I was never sure if my 1953 M38A1 CDN had the signal lights added in service or post service.  But it sounds like the M38's & M38A1's underwent the same modification orders to add the lights.  Mine is exactly as you both describe, and it has the Do-ray 999 signal arm that Rob mentioned. 
 
As far as the light lens cover: mine just had the blackouts with the insides removed.
		 
		
		
		
		
		
		
			
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				1953 M37 CDN 
 1953 M38A1 CDN 
1967 M38A1 CDN2
			 
		
		
		
		
		
	
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