NBC’s Concentration, aired for 14  years, 7 months for a total of 3,770 telecasts
from August 25, 1958 to March 23, 1973, the longest run of any game show on
NBC. The series was hosted by Hugh Downs (pictured above) and later by Bob
Clayton (below). For a six-month period from March to September 1969, Ed
McMahan hosted the show which was based on the children’s memory game
of the same name.
 

Rare shot of Bob Clayton in front of the puzzle board

The first issue of the Concentration Puzzles magazine