Because I started school in 1969 at age 6, so would be unable to see the morning shows, all my Concentration memories are from about 1966-1969 with Hugh Downs. I especially remember one show--and if anyone remembers this or has archive access to know the air date, please let me know. The game had just started and a lady had matched the first two pieces of the puzzle. As with most puzzles, at that stage, the first two pieces wouldn't be much help to solving the puzzle. But, as was customary, the woman was asked if she'd like to solve the puzzle. She made an exasperated sound then said, "I don't have the slightest idea." She was shocked when she was told, "You're absolutely right!!" That was the answer to the puzzle and she was the winner!! The rebus was revealed and that was what it said. Talk about saying the right thing at the right time!
What was great about the show is that it was suitable for all ages. At that time, I also had the home game of Concentration. Wish I still had it now!