The pre-decimal sixpence (6d) was a unit of currency equalling one fortieth of a pound sterling, or six pence sterling. It was used in the United Kingdom, and earlier in Great Britain and England.
The denomination had undergone several earlier changes in design, and was in silver until the first issue of King George VI was debased to copper-nickel after 1946. Its design featured the crowned cypher (monogram) of the monarch, which referred to his title of Emperor of India, and his legend with the same style. This second issue replaced it in 1949 when the title was dropped due to the Independence of India; it was issued until the King's death and was replaced by a new type at the start of the reign of Queen Elizabeth II.
Sixpences continued to be legal tender for a while after the currency became decimal in 1971, with a value of 2 1⁄2 new pence, until they were demonetised on 30th June 1980.