A single prototype was ordered by the British Army in April 1899, a few months before the Second Boer War broke out. It was built by Vickers, Sons & Maxim of Barrow on a special Coventry-built Daimler chassis and had a German-built Daimler engine.
Because of difficulties that arose, including a gearbox destroyed by a road accident, Vickers did not deliver the prototype until 1902, and by then the South African wars were over. The vehicle was an improvement over Simms's earlier design, known as the Motor Scout, which was the first armed (but not armoured) vehicle powered by a petrol engine.
The vehicle had Vickers armour 6 mm thick and was powered by a four-cylinder 3.3-litre 16 Horsepower Cannstatt Daimler engine, giving it a maximum speed of around 9 miles per hour (14.5 km/h). The armament, consisting of two Maxim guns, was carried in two turrets with 360° traverse. Some sources also mention a single QF 1 pounder pom-pom.
Fully equipped, the vehicle had a length of 28 feet (8.5 m) overall, with a beam of 8 feet (2.4 m), a ram at each end, two turrets, and two guns. It was "capable of running on very rough surfaces". It was designed to be operated by a crew of four men.
- Edward John Barrington Douglas-Scott-Montagu Baron Montagu of Beaulieu; Lord Montagu; David Burgess Wise (1995). Daimler Century: The Full History of Britain's Oldest Car Maker. Haynes Publications. ISBN 978-1-85260-494-3.
- Macksey, Kenneth (1980). The Guinness Book of Tank Facts and Feats. Guinness Superlatives Limited. p. 256. ISBN 0-85112-204-3.
- Tucker, Spencer (1999). The European Powers in the First World War. Routledge. p. 816. ISBN 0-8153-3351-X.
- Armoured Fighting Vehicles of the World, Duncan, p. 3
- Gougaud, Alain (1987). L'aube de la gloire: les autos mitrailleuses et les chars français pendant la Grande Guerre, histoire technique et militaire, arme blindée, cavalerie, chars, Musée des blindés. p. 11. ISBN 978-2-904255-02-1.