British medium tank also known as the Vickers "16-tonners". Three prototypes were produced by Vickers from 1926 through 1931. According to some sources, three more tanks were manufactured in 1933 and remained in service through 1938 but never saw action.
Time for the successive autoreloading of each shell into the magazine.
The technical characteristics shown are for the Siege mode
Characteristics are specified for a vehicle with crew members trained to 100%.