Concentration had a tradition of having two----count 'em, two---"Santa Claus"es playing the game on Christmas Eve. Hugh Downs (The Today Show, later of 20/20) is the host, and this episode is near the end of his run. Bob Clayton would take over and carry the baton until NBC cancelled the series 5 years later.
This particular treat comes from 1968, and uploaded by thechadmosher.
Today, the only way you can play the game is to go online, as Yahoo! has it on its games page, or at least the last I knew. You'd think someone would have the stones to revive the show for the 21st century......!