1958 Land Rover Series II.

The successor to the successful Series I was the Series II, which saw a production run from 1958 to 1961. This was the first Land Rover to receive the attention of Rover's styling department - Chief Stylist David Bache produced the familiar 'barrel side' waistline to cover the vehicle's wider track and the improved design of the truck cab variant, introducing the curved side windows and rounded roof still used on current Land Rovers.

MM

Early Series II vehicles were fitted with the old 2-litre petrol engine to use up existing stock from production of the Series I.

Source: wikipedia.org