First game I went to featuring Birmingham was at Millmoor in Feb 1967 in the FA Cup 4th round only two weeks after we had completed the double over them in the league (both games 3-2) with the win away the previous September coming after we were 2 down at half time.

Unfortunately we could only draw 0-0 in the Cup but Trevor Hockey (later of Sheff Utd) hit the bar with a penalty at the Railway end.
We lost 2-1 in the replay at St. Andrews 3 days later