Nadiaa Comaneci of Romania, she had perfect tens at Montreal Summer Olympic held in 1976. I just remember her performance scenes.
Nadia got perfect score of 10.00 during the team portion of the competition on the uneven bars when Nadia was the age of 14. It was the first time in modern Olympic gymnastics history that the score had ever been awarded.
The scoreboards were equipped to handle three digits only that Nadia’s perfect marks, 10.00, were reported on the boards as 1.00 instead shown in following YouTube video. Over the course of the Olympics, Nadia earned six additional 10s.