Start with what the Land Rover Series I is: a car with gasoline engine, from Land Rover. What it meant takes a little longer.
The engineering
The engine is gasoline engine. On the scales it comes to 1177 kg. These are manufacturer figures carried by Wikipedia and Wikidata, not road-test measurements.
Where it sits
Its Land Rover stablemates include the Land Rover Defender L663 and the Land Rover Discovery Sport.
Land Rover Series