HMS Iron Duke Unofficial badge 1912.
HMS Iron Duke was a battleship of the Royal Navy, the lead ship of her class, named in honour of Arthur Wellesley, 1st Duke of Wellington. She served as the flagship of the Grand Fleet during the First World War, including at the Battle of Jutland. For the majority of the Great War, she was based with the rest of the Grand Fleet at Scapa Flow in Scotland.Iron Duke was launched on 12 October 1912 at Portsmouth, England, the first of her class. After commissioning, she joined the Home Fleet as the flagship of Admiral Sir George Callaghan. Shortly before the beginning of hostilities, Callaghan was relieved by Admiral Sir John Jellicoe, who made Iron Duke the flagship of the newly organized Grand Fleet. Her only major combat service during the First World War came in the Battle of Jutland on 31 May 1916, where she served in the Fourth Battle Squadron. She delivered a number of significant shell hits on the German battleship SMS König, at the point when the two main fleets collided.
Pre-dates the official badges brought into the Royal Navy in 1919