As a kid, my exposure to sporting events was mostly relegated to local market TV stuff. Being in Northern NJ, that meant Mets or Yankees for baseball on WWOR or WPIX. I had an Uncle who was really into the Mets and when he went to games he would often pick me up a program to try to induce in me some sort of fandom. I cannot say it worked out liked he planned, but I did keep every program and magazine he gave me and I recently started looking through them for content to share on the site.
Here is an ad for a “Metsmerized” t-shirt that I would have been more than happy to send away for and wear if I could have scrounged together the 7 bucks for it.