A champions at 12, Karen Muir shatters backstroke record.

London Illustrated News - August 21, 1965
It was the warmest day of the year in Blackpool but Karen Muir, a 12-year-old South African schoolgirl, pulled her green wool cap down over her ears as she sat beside the pool in the Derby Baths. "My mother knitted it and told me to wear it. I get ear-aches," she said in a jerky Afrikaans accent