The Tank Museums TOG II was completed in 1941. It was so heavy they could only weigh half at a time. The tank was fitted with four different gun turrets between 1941 and 1944, ending up with the type of turret designed by Stoddart and Pitt for the A30 Challenger Heavy Cruiser Tank. This mounted a 17pdr gun, making the tank a TOG II.
Could the The Tank Museums TOG II fridge magnet be the heaviest fridge magnet on earth?