Well, I've been digging in the Life magazine photo archive again and this time came up with plenty of pictures that were taken in January, 1950 during the NTSC color tv hearing in Washington, DC. These are the famous hearings that caused the FCC to approve the CBS system. This is the original magazine article:
http://books.google.com/books?id=_lI...b%2027&f=false
And, here is the photo series:
http://images.google.com/hosted/life...777db5019.html
Many photos are obviously duplicates. The great thing is that there are several behind the scenes shots of the actors that should give a good reference for the screen image. However, many of the photos are more washed out than others. Maybe the photographer was trying different film, filters, lighting? Most likely he was using different exposure settings, or they were done while making duplicates.
It is hard to know on all the pictures which is CBS and which is RCA. Obviously, the women in front of the paintings are of the CBS system. And, they are clearly superior to the RCA. The article mentions the third system by Color Television Inc. Could some of these be from them?