Mark III
The Mark III Hawk was a completely new car and was first shown at the London Motor Show in October 1948, but it still retained the earlier engine (side-valves, 1944 cc, 56 bhp at 3800 rpm) and transmission albeit with new rubber mountings.
The new body was styled by the Loewy Studio and the separate headlights of the old model were gone, along with the separate front wings.
The chassis was new, with coil-sprung independent front suspension replacing the previous transverse leaf spring.
The body was now an integral component of the car's structure.
The rear axle was also a new design with hypoid gearing.
The body could be finished in a wide range of colours, both as two-tone and metallic.
The metallic finishes would be offered on all the Hawks until the model's demise in late 1967/early 1968.

When compared with the prewar style body with vestigial running boards the car's weight was less by 3 cwt or 336 lb (152 kg) and the new flush-sided body gave room for the front bench seat to be three inches (76 mm) wider.
The rear seat was a full five inches (130 mm) wider.
Overall the car was six inches (150 mm) shorter and one and a half inches (38 mm) lower.
Despite the lower height the new hypoid back axle allowed more head room in the rear seat.

Mark IV
In the early spring of 1951 the Mark IV version arrived with a larger, 2267 cc engine incorporating, as before, an aluminium cylinder head and with a 58 instead of 56 bhp output.
However, at mid range speeds around 15 percent more power was generated.
The Mark IV also used larger, 15-inch wheels.
The steering was now more highly geared and was commended by commentators for its lightness when manoeuvering the car in a confined space despite 53% of the car's 2,996 pounds (1,359 kg) being carried by the front wheels.

A 2267 cc Mk IV car tested by the British magazine The Motor in 1951 had a top speed of 71.4 mph (114.9 km/h) and could accelerate from 0–60 mph (97 km/h) in 30.0 seconds.
A fuel consumption of 24.2 miles per imperial gallon (11.7 l/100 km; 20.2 mpg‑US) was recorded.
The test car cost £850, including taxes.

Mark V
The Mark V Hawk announced in September 1952 was given a larger clutch, larger rear shock absorbers, a strengthened body-frame and other minor mechanical changes.
A new treatment was given to the car's front.
It was also available as a "luxury touring limousine".
A lowered bonnet line and wrap-around bumpers with over-riders distinguished this model from the Mk IV
Mark III
The Mark III Hawk was a completely new car and was first shown at the London Motor Show in October 1948, but it still retained the earlier engine (side-valves, 1944 cc, 56 bhp at 3800 rpm) and transmission albeit with new rubber mountings. The new body was styled by the Loewy Studio and the separate headlights of the old model were gone, along with the separate front wings. The chassis was new, with coil-sprung independent front suspension replacing the previous transverse leaf spring. The body was now an integral component of the car's structure. The rear axle was also a new design with hypoid gearing. The body could be finished in a wide range of colours, both as two-tone and metallic. The metallic finishes would be offered on all the Hawks until the model's demise in late 1967/early 1968.
When compared with the prewar style body with vestigial running boards the car's weight was less by 3 cwt or 336 lb (152 kg) and the new flush-sided body gave room for the front bench seat to be three inches (76 mm) wider. The rear seat was a full five inches (130 mm) wider. Overall the car was six inches (150 mm) shorter and one and a half inches (38 mm) lower. Despite the lower height the new hypoid back axle allowed more head room in the rear seat.
Mark IV
In the early spring of 1951 the Mark IV version arrived with a larger, 2267 cc engine incorporating, as before, an aluminium cylinder head and with a 58 instead of 56 bhp output. However, at mid range speeds around 15 percent more power was generated. The Mark IV also used larger, 15-inch wheels. The steering was now more highly geared and was commended by commentators for its lightness when manoeuvering the car in a confined space despite 53% of the car's 2,996 pounds (1,359 kg) being carried by the front wheels.
A 2267 cc Mk IV car tested by the British magazine The Motor in 1951 had a top speed of 71.4 mph (114.9 km/h) and could accelerate from 0–60 mph (97 km/h) in 30.0 seconds. A fuel consumption of 24.2 miles per imperial gallon (11.7 l/100 km; 20.2 mpg‑US) was recorded. The test car cost £850, including taxes.
Mark V
The Mark V Hawk announced in September 1952 was given a larger clutch, larger rear shock absorbers, a strengthened body-frame and other minor mechanical changes. A new treatment was given to the car's front. It was also available as a "luxury touring limousine". A lowered bonnet line and wrap-around bumpers with over-riders distinguished this model from the Mk IV
Humber Hawk