I looked at this display often over the summer. The Phillies had this in a case at Citizens Bank Park in the Hall of Fame Club. I took a few pictures of the cards inside and meant to share them sooner.
However, it took nearly two months for me to post this.
According to the paper, this is only a partial collection on the Szwajkos family, a collection that spans over 80 years.
The cards in the display are only people who have been enshrined into Cooperstown.
Check out some of these cards. They are pretty nice.