The main armament of the new American battleships according to the Dutch magazine Marineblad dated 1937 No. 3

Colorado-class

North Carolina-class

South Dakota-class

An item referred to the Proceedings dated March 1937 reporting that the new American battleships were to have a main armament of 3x3-40,6cm/16” or 3x4-35,6cm/14” guns.(1)

Note
1. This must be the North Carolina-class fast battleships consisting of the North Carolina and Washington, preceded by Colorado-class and the never realized South Dakota-class and succeeded by the South Dakota-class and with a main armament of 3x3-40,6cm/16” guns and an armour consisting of a 30,48cm/12” thick deck and 17,78cm/7” thick deck.