'County' is a trim level designator that has been used by Leyland for at least Series 3, Rangerover and 90/110. 
In Australia it became an informal reference to pre-Defender 110s (Note: not 90, as they were not sold here), probably because the most numerous model was the station wagon, which, I'm pretty certain, was sold only with 'County' trim and only with either the 3.5 V8 or Isuzu diesel. Four cylinder engines were not sold in Australia in this period. These wagons were prominently labelled with 'County' on the doors, and the name gradually transferred to the other models - hardtop, trayback ute with 120" wheelbase, and 6x6 (although these were usually just referred to as "6x6"). 
With the introduction of the Discovery in 1990, and the final cessation of local production, there were no traditional Landrovers sold here, but continuing demand led to the re-introduction of the (fully imported) Defender a year or two later. These had different engines, and the differences probably cemented the practice of referring to all earlier coil sprung Landrovers as Counties (or should it be 'Countys'?), even when they are not, just to distinguish them.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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