Oldest surviving videotape is of President Eisenhower recorded in 1958:
Next is Dinah Shore from 1958:
Filmed screen from 1949!!!!!! CBS color video test:
1960 Steve Allen Plymouth Show in color: (Love the car ads)
September 1, 1964 Tonight Show segment:
1959 Betty White commercials:
As a bonus, I'm including a segment on NAZI television from 1935. As Operation Paperclip revealed, the NAZI's were light years ahead of the rest of the world in certain areas of technology. German TV in 1935 used more sophisticated equipment than American TV of the early 1950's.