The twin 381 mm (15") turret of the Batteria Amalfi, built near Venice during WWI for coastal defense purposes; the guns were originally meant for the Francesco Caracciolo-class battleships.
Royal Netherlands Navy's Zwaardvis class lead boat Zwaardvis (S-806) & Royal Navy's Valiant class lead boat HMS Valiant (S-102) at Devonport Dockyard, Plymouth Navy Day, 08/1977.