"25 years ago, my grandfather broadcast the first of these messages." Queen Elizabeth can be seen saying, paying tribute to her late grandfather King George V who began broadcasting Christmas messages on the radio in 1932.
"Today is another landmark, because television has made it possible for many of you to see me in your homes on Christmas Day."
One Instagram user marvelled at the sight of the 31-year-old Queen. They commented: "She was so young. She sounds like a baby."
Another said: "And what a true privilege it must have been to be able to see and hear Her Majesty for the first time. Long live the Queen."