Original envelope, addressed by the King “To His Grace The Duke of Buckingham and Chandos”, signed lower left. Complete envelope 3 x 5 inches, roughly opened, black borders, black wax seal. Annotated: King of Hanover, 28 July 1843. H.R.H. Prince Ernest Augustus, Duke of Cumberland and King of Hanover (1771-1851), fifth son of King George III and Queen Charlotte. He became King of Hanover on the death of his elder brother, King William IV, in 1837.