In 2013, the essay, which is believed to be one of the earliest works by Sir Paul, will go on public display to mark the 60th anniversary of the coronation.
Liverpool's Lord Mayor had awarded the young McCartney with the prize, which was the winner despite some grammatical errors.
McCartney as a boy had compared the celebrations for the occasion outside Buckingham Palace with the coronation of William the Conqueror nine centuries ago and he had commented that the "present day royalty rules with affection rather than force".
