The King's Badge was a large silver pin to be worn only on civilian clothing. It was issued by the British government to persons who served after World War II

World War II

World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

 was declared, on September 3, 1939, and who were discharged through injury due to war service.

Its basic purpose was to show that the wearer was a veteran. Included among the eligible were members of the armed forces, the merchant navy, the fishing fleets, the Coast Guard, police, Civil Defence Service

Civil Defence Service

The Civil Defence Service was a civilian volunteer organisation established in Great Britain by the Home Office in 1935. In 1941, during World War II, the use of Civil Defence replaced the pre-existing Air Raid Precautions...

s, and the Home Guard.
Like the better known Silver War Badge of World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

, the King's Badge included the initials GRI for Georgius Rex Imperator, in this case referring to King-Emperor George VI. (The earlier badge was in the name of his father, George V

George V of the United Kingdom

George V was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 through the First World War until his death in 1936....

.) The wording around the initials was also changed from For King and Empire Services Rendered to For Loyal Service. While it did come with a certificate, the King's Badge was not serially numbered.