Gents, 
 
The Aust No.3 and 3A by Ford was only produced in a much smaller quantity than '1334' - less than 500 were built, all with production numbers in the form 'JT-1 to JT-XXX'.   
 
Unless you have the original nomenclature plate which has the 'JT-XXX' number stamped onto it, or the remains of the original registration number painted on in white, usually across the lower rear, and/or on the lower side towards the front, then there is no way I know of to identify the actual trailer. As far as I'm aware, the production number was not stamped onto the body/frame anywhere - only on the plate. 
 
Regards 
 
Mike C
		 
		
		
		
		
		
		
		
		
	
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