Most of the games from Colin Bell's time probably weren't recorded.I don't think there can be any, otherwise it would have been posted in this thread well before now.
Remember in the 70s there were a couple of games on Match of the Day on Saturday and The Big Match on the Sunday. There was always footage of a game on 'News and Sport' which was early Sat evening I think ( very 'grainy' footage.)
Seem to recall seeing a few highlights on Sportsnight midweek. (Cup replays and European matches)
Nationwide 'followed' City force season didn't they, think I may still have the book the BBC produced about it.