The Florida-class battleships of the United States Navy comprised two ships: Florida and Utah. Launched in 1910 and 1909 respectively and commissioned in 1911, they were slightly larger than the preceding Delaware class design but were otherwise very similar. This was the first US battleship class in which all ships received steam turbine engines. In the previous Delaware-class, North Dakota received steam turbine propulsion as an experiment while Delaware retained triple-expansion engines.
The Pennsylvania class of six armored cruisers served in the United States Navy from 1905 to 1927. All six were renamed for cities 1912–1920, to make the state names available for the new Pennsylvania class battleships. All of them served during World War I, with California being the only ship of the class to be lost. The remaining five armored cruisers were scrapped between 1930 and 1931 in accordance with the London Naval Treaty.
The 6"/47 caliber Mark 16 gun was used in the main batteries of several pre-war and World War II US Navy light cruisers. They were primarily mounted in triple turrets and used against surface targets. The 6"/47 caliber Mark 16DP gun was a dual purpose fitting of the Mark 16 for use against aircraft as well as surface ships. It was installed in the post-war Worcester-class light cruisers and the anti-aircraft gunnery training ship Mississippi.
The 14"/45 caliber gun,, whose variations were known initially as the Mark 1, 2, 3, and 5, and, when upgraded in the 1930s, were redesignated as the Mark 8, 9, 10, and 12. They were the first 14-inch (356 mm) guns to be employed with the United States Navy and were, for over a year, the most powerful naval ordnance afloat. The 14-inch/45 caliber guns were installed as the primary armament aboard all of the United States Navy's New York-class, Nevada-class, and Pennsylvania-class battleships. The gun also saw service in the British Royal Navy, where it was designated the BL 14 inch gun Mk II.
The 16"/50 caliber Mark 2 gun and the near-identical Mark 3 were guns originally designed and built for the United States Navy as the main armament for the South Dakota-class battleships and Lexington-class battlecruisers. At the time, they were among the heaviest guns built for use as naval artillery.
The German 28 cm C/28 was a 283 mm 52-caliber built-up gun designed in 1928 and used on the Deutschland class pocket battleships.
Third year type 20 cm/50 caliber guns formed the main battery of Japan's World War II heavy cruisers. These guns were also mounted on two early aircraft carriers. The typical installation was ten 20 cm/50 guns; although Tone-class cruisers carried eight while Furutaka and Aoba-class cruisers carried six. After modernization, Akagi carried only six.
The 203 mm/53 Ansaldo was the main battery gun of Italy's most modern Washington Naval Treaty heavy cruisers. This treaty allowed ships of not more than 10,000 tons standard displacement, and with guns no larger than 8 inches (203 mm), to be excluded from total tonnage limitations on a nation's capital ships.
The Cannone da 381/50 Ansaldo M1934 was a 381-millimeter (15.0 in), 50-caliber naval gun designed and built for the Royal Italian Navy by Gio. Ansaldo & C. in the 1930s. The gun served as the main armament of Italy's last battleships, the Littorio class. These built-up guns consisted of a liner, a cylinder over the chamber and part of the rifle bore, a full-length cylinder, and a 3/4 length jacket with a hydro-pneumatically operated side-swinging Welin breech block. 40 barrels were produced in total by Ansaldo and O.T.O., but none survive to this day. Each battleship carried nine guns mounted in three triple turrets with maximum elevation of 35°. Time between salvos was approximately 45 seconds.
The 12"/50 caliber Bethlehem gun was a US naval gun designed in 1910 as the main armament for the Argentine Navy’s dreadnought battleships of the Rivadavia class.
The 203 mm /50 Model 1924 was an Italian 203 mm naval gun. Manufactured by the Ansaldo engineering company in the years before World War II for the Italian Navy, the use of these guns was limited to the Trento-class heavy cruisers and coastal defense batteries during the second world war.
The 152 mm /53 Model 1926–1929 were built for the Italian Navy in the years before World War II. These guns were used on all Condottieri-class light cruisers except the Duca degli Abruzzi-class.
The 152 mm /55 Model 1934–1936 were built for the Italian Navy in the years before World War II. These guns were used on the Duca degli Abruzzi-class Light cruisers, which were the final series of the Condottieri-class cruisers as their primary armament and as secondary armament on the Littorio-class battleships.
The Škoda 19 cm vz. 1904 was a naval gun of the Austro-Hungarian Empire that was used by the Austro-Hungarian Navy during the World War I. The 19 cm vz. 1904 was also used by the Italian Navy and Italian Army as coastal artillery during World War II. The Italians referred to it as the 190/39.
The Škoda 30.5 cm /45 and Škoda 30.5 cm /45 K10 were a family of related naval guns of the Austro-Hungarian Empire that were used aboard the last classes of pre-dreadnoughts and dreadnoughts of the Austro-Hungarian Navy during the World War I. Guns salvaged from these ships after World War I were later used by the Royal Italian Army as coastal artillery during World War II.
The 203 mm 50 caliber Pattern 1905 was a Russian naval gun developed by Vickers for export in the years before World War I that armed a variety of warships of the Imperial Russian Navy. Guns salvaged from scrapped ships found a second life as coastal artillery, railway artillery and aboard river monitors during the Russian Civil War. By 1941 it was estimated there were 36 coastal defense guns and two railroad mounts remaining. During the 1930s a number were relined down to 180 mm (7.1 in) and re-designated the 180mm Pattern 1931-1933. These guns were used aboard Kirov-class cruisers or as coastal artillery and railway artillery.
