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					Originally Posted by  rob love
					 
				 
				I would like to know more about this subject myself.  
 
All I have seen is that from pre-war until 1942, the numbers took the form of 
41-1-1234.  
 
The 41 was the year the vehicle was accepted into service, the 1 seemed to always be in the equasion, and the next batch of numbers (could be one, two or three or 4 digits) was the unique number assigned to that vehicle.  
			
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 My ex Ford 15cwt 11 cab that came from Shilo still had the pre-1942 markings on the door. Only the '1' in the middle was a 'Z' which I always took for truck like in the later system.