Not unusual with any locally assembled or even imported car - same applies to my 110, compliance late 1986, but chassis number (and features such as lift up door handles and four speed box) says beginning of 1986.
John
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Land Rover Service Information Vol 1 No 2 Item 6, April 1972 gives an explanation:
Series III type all syncromesh gearbox adapted for use on Series IIA Bonneted Control models - 4 cyl - Part No. New - 607125, Part No. Rebuilt - 607126; 6 cyl - Part Nos. 607127 and 607128 respectively. There are also sealed clutch withdrawl unit versions listed.
Bob
But Series 2A Suffix "G" fitted with 6 cylinder motors also were fitted with brake boosters - so all suffix "G" onwards 109WB front guards driver's side complete are Part No 354566. Suffix "G" onwards also has the stepped inner guard splash panel.
Outer guard panel passengers side Series 2A Vehicle Suffix "G" 330427 - no heater fresh air inlet hole. This part no is the same from at least 1959 with the introduction of the Series 2. (Series 2 Parts Catalogue Part No 4187 p239)
Prior to the Series 3 optional heaters fitted are the cylindrical and later flat type recirculating heaters on the firewall over the transmission and under the metal dash tray.
Series 3 vehicles were the first routinely fitted with the combined recirculating/fresh air type heaters, not that they worked anything like as good as the recirculating ones they replaced. So there was a hole for the fresh air intake in the outer guard as well as the larger rectangular hole in the firewall allowing either fresh or heated airflow into the chamber in the lower sloping dash for distribution to the demisters and lower dash outlets:
Outer guard panel passengers side Series III 345475 - has the heater inlet hole.
The first reference I have for the fresh air type heater is in the Optional Equipment Parts Catalogue Sept 1975 - can't find my earlier one. I imagine Australian Design Rules (ADRs) would have meant heaters were by then fitted as standard, more to be used as demisters than heaters.
ADR 15 - Demisting of Windscreens - came into effect 1 January 1971.
If you want to know what the numbers on compliance plates of this period refer to have a look here:
Second Edition Australian Design Rules
Not all appear to have applied to Land Rovers as they were not classed as passenger car derivatives but as "motor lorries" or "goods carrying vehicles", "omnibuses" etc. and so sometimes fell outside the scope of the ADRs intended for passenger cars.
Bob