This was the last of NBC's black and white shows to convert to color, on 7 November 1966. It made NBC-TV the first all-color television network.
In March 1973, the New York-based "Concentration" was canceled by NBC after 14 years. Six months later, Concentration (1973) returned to television in syndication. The production was moved to Los Angeles and lasted an additional 5 years in first-run syndication.
The original network daytime series, "Concentration", appeared on NBC for 14 years, 7 months, and 3,770 telecasts (August 25, 1958 - March 23, 1973), the longest continuous run of any game show on that network (Wheel of Fortune was a month shy of tying that record when the initial NBC run ended on June 30, 1989). This series was hosted by Hugh Downs and later by Bob Clayton, but for a six-month period in 1969, Ed McMahon hosted the series. The series began at 11:30 am Eastern, then moved to 11:00 and finally to 10:30. Nearly all episodes of the NBC daytime version were produced at 30 Rockefeller Plaza, New York City.
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