In 1938 the South African government ordered two types of armored cars to be developed by the South African automobile industry. Development was slow and when the war started in 1939 the designs were ordered into production.
The Marmon-Herrington armored cars were made from Ford truck chassis, made in Canada; a Marmon-Herrington transmission, made in the United States; and armament from the United Kingdom. These were assembled in railway workshops and vehicle assembly plants in South Africa.
An armored hull was placed onto the truck chassis.
The first vehicles had riveted construction but this was changed to welded.
The Marmon-Herrington Mk II started out with a 7.7 mm Vickers machine gun in the turret and a light machine gun in the hull. After combat experience the turret machine gun was replaced by a 13.97 mm Boys anti-tank rifle.
South Africa produced the armor for the Marmon-Herringtons.