On August 4th of that year, two young chefs had been walking in the Cairngorms National Park near Perth when they spotted a strange diamond-shaped object in the sky nearby.
Terrified, the men hid behind some bushes to observe the mysterious craft.
A short time later, they heard the sound of an RAF jet approaching. The plane seemed to change course and circle the UFO for a time before returning to its original course.
Keen to take a photograph, one of the men aimed their camera at the sky and took a few snaps.
A few seconds later, the object flew upwards into the heavens and was gone.
Convinced that they had seen a UFO, the men passed their best photograph along to a local newspaper, however it was promptly handed over to the Ministry of Defense and was never published.
The image would stay classified, in fact, for over 30 years until it turned out that retired RAF officer Craig Lindsay had broken protocol by stashing a copy of it inside his desk.
Now 83, he was only too happy to provide the image so that it could finally see the light of day.
Intriguingly, it shows exactly what the two men had described – a diamond-shaped object hovering in the sky with the RAF jet visible circling it in the background.
Exactly what the object could have been, however, continues to remain a mystery.