For more than half a century the modest clock has been respectfully protected – wrapped in dusters – by the family of the man who pulled it out of the rubble on that terrible day.
Now the Aberfan school clock, which stopped at 9.13am on 21 October 1966, the precise time an avalanche of coal waste crashed into classrooms and homes, claiming the lives of 116 children and 28 adults, is to go on display at a Welsh museum.