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A-150 Super Yamato 'Omi', naval miniature ship, scale model 1:1800 , Battleship
Design A-150, also known as the Super Yamato class, was a Japanese plan for a class of battleships. Begun in 1938–39, the design was mostly complete by 1941. Design A-150 would have been the most powerful battleships in history because of the massive size of their main battery of six 510 mm (20 in) guns as well as numerous smaller caliber weapons.