The Medium Mk.III was a further evolution of the Vickers Medium Mk.I and II tanks. Only three of these multi-turreted tanks were built.
Cold War British Prototypes Archives - Tank Encyclopedia
Vickers Medium Mk.D with a Type 3 Chi-Nu Turret : r/CursedTanks
WW2 US Medium Tanks Archives - Tank Encyclopedia
WW2 British Prototypes Archives - Page 2 of 3 - Tank Encyclopedia
Vickers Medium Mk.I & Mk.II - Tank Encyclopedia
Vickers Mk.3 - War Thunder Wiki
WW2 British Cruiser Tanks Archives - Tank Encyclopedia
Vickers Medium Mk.D - Tank Encyclopedia
Vickers Medium Mk.I & Mk.II - Tank Encyclopedia
Vickers Medium Mk II tank
WW1 British Medium Tanks Archives - Tank Encyclopedia
Cold War British STT Archives - Tank Encyclopedia
Vickers Medium Mk.I & Mk.II - Tank Encyclopedia