For a start, it is a chassis number not a VIN - Vehicle Identification Numbers did not exist then; A VIN is a much larger sequence of numbers and letters, and is unique to that specific vehicle, with parts of the number identifying the manufacturer, the model and various other details.
A chassis number is simply a serial number assigned by the manufacturer without reference to any other use of that number outside that manufacturer or sometimes even that model. So you need the manufacturer's records to get anything other than the barest information. 
In this case, the suffix gives the significant manufacturing changes, and you already have the dates of that. The only other part of the number I can help with is that the 347 shows it to be a six cylinder Right Hand Steering CKD (Completely Knocked Down) Export model. (Information from the workshop manual) The 1966 is the serial number; I don't know how many Export RHD CKD sixes were sold with suffix D, but I'm guessing that this was probably fairly close to the end of the sequence, hence close to the end of the 'D' time period. Australia would have been the largest market for RHD CKD Landrovers at that time.
At this date, CKD Export RHD is what you would expect to find for an Australian assembled vehicle, and the bulkhead would have shown it to be originally a six, so it really just confirms what you would already have guessed.
Hope this helps
John
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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