As I recall, my family made a point to stay home on the night "Nichols" was on (Mondays? Tuesdays? NBC?). It was a superb vehicle for James Garner, very well written, great ensemble cast. His character very much like the "Support Your Local..." films: Retired gambler with mysterious past settles into town and has adventures every week. In fact, it seemed fairly obvious that it was the same character. It was just a charmer of a TV show. A sleeper, like "My World And Welcome To It", which may have been its contemporary--I forget. I dearly wish these shows would be made available on DVD. It was Just Good TV. Perhaps "Briscoe County Jr." come close, but only by a mile.
Review of Nichols
