Thanks to this great community, I was able to get my hands on a baseball program. Probably one of the oldest still in decent condition.
Since there's no mention of a price, I suppose that it was handed out for free to any game ticket holder. I shall look into it just to make sure.
I believe it was the program for Game 4 of the Championship Series: Philadelphia won at home 9-7 to take a 3-1 lead in the Series.