I know I rarely (if ever) post here, I'm more of a lurker, but I came across something Cubs related that I was hoping I might get some help identifying. While in a used bookstore a couple months ago, I came across a copy of Wait Till Next Year, and having never read it, I figured I'd buy it. Inside the book was a ticket stub of some sort from the Cubs that looks somewhat old, and having no idea what exactly this was, I figured I'd come on here to ask the best Cub experts I know. Below are two images (one the front, one the back) of the stub.
If anyone could tell me what the heck this thing is to satisfy my personal curiosity, I'd appreciate it.