The Sheerline was designed by Austin during World War Two but production did not begin until 1947 because of the commitment to war production. It was a luxurious car in the style of the contemporary Rolls-Royce or Bentley but at a much lower price, around two-thirds of the price of the equivalent Rolls-Royce but still the price of five or six small Austins. There were about 8000 built but it is now becoming quite rare.
The first cars, designated A110, had a 3460 cc straight 6 overhead valve engine but this was soon increased to 3995 cc with 125 bhp (93 kW) and the designation then became A125. Initially only a Saloon version on a 9-foot-11+1⁄4-inch wheelbase chassis was made, but this was joined by a (rare) Limousine version in 1950 on a stretched 11-foot (3 m) chassis. Later on there came more versions, including a hearse and an ambulance. At 37 hundredweight (1850 kg) for the saloon and 2 tons (2000 kg) for the limousine this was a heavy car, and to maintain performance a low final drive ratio of 4.55:1 with 16-inch tyres was fitted. Suspension was by coil springs at the front and half-elliptic leaf springs at the rear. The saloon version had a top speed of 82 mph (132 km/h).
In 1954 production ceased with the Austin luxury category passing to the similar A135 Princess Mk II which had also been in production since 1947 and would continue until 1956.