I never saw a game at Forbes Field. It was located near my University of Pittsburgh dormitory and we watched it being torn down when I was a freshman. It’s the site of the Pitt Law School now. They kept part of the outfield wall where Bill Mazeroski’s home run went out to win game 7 in the 1960 World Series.
When I was a freshman in 1971, Forbes Field was no longer used but hadn’t been torn down yet.