Mary Tyler Moore takes me back to the winter of 1972. As a 4th grader, I remember this being the time of President Nixon's historic visit to China during the height of his presidential popularity.
One of the all-time great shows. I'd put the last three seasons of MTM up against any sitcom in history. Excellent writing--on par with Cheers and Taxi. Great last episode too. The final scene always brings a tear to my eye.