Sixty-two years ago today the Queen launched the Royal Yacht Britannia on Clydeside, the vessel which Portsmouth would proudly claim ownership of for the next 44 years.
This picture was taken of her leaving Portsmouth Harbour in the months following her launch when thousands turned out to see her.
The two other photos show the Queen conducting the naming ceremony and an interesting shot taken by Dave Sullivan from Havant, a guide at the Royal Navy Submarine Museum.
It shows Britannia entering Portsmouth Harbour for the last time on November 22, 1997, at 11.11am.
Dave pressed his camera to a periscope at the museum and this is the result.
To see video of the launch click here.