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Here is something that might help you with sorting out your Land Rovers. Basically, Corgi issued two main models: the Series I and Series II, all with Land Rover 109" W.B. on the base but with many variations.
All the Series I models had fixed wheels and neither interior nor suspension.
All the Series II models had free-spinning wheels, interiors and suspension.
Where the catalogue number shows GS the model was only issued in a Gift Set.
Illustrations of the different wheels, vent types, handles and interiors will be provided in due course.