The Vickers Medium tank Mk.I was another famous interwar British tank. It was of the same early twenties generation, fitted with a full traverse three-man turret (for the first time in the world), new suspension system, and a quick-firing 3 pdr (47 mm/1.85 in) gun. 200 were built and phased out for training in 1938. The next Medium Mk.II was mostly similar but improved during many years. Production stopped in 1934. Many were reactivated and served in secondary duties during early WW2.