https://www.freelists.org/post/opend...-to-NTSC-Color
https://www.freelists.org/post/opend...-to-NTSC-Color
https://www.freelists.org/post/opend...ate-BW-Network
In this case, it might be an NBC/ABC affiliate in 1961 (before the 1st ABC color broadcast), the NBC feed was 29.97fps NTSC Color, the ABC feed was 30.00fps B&W.
The local station would do a "glitch take" switching between the NBC and ABC content.
Kirk Bayne