Onemillioncubs.com found this funny video of a humorous look at inner workings of a 1968 Topps factory.
In this sneak peek of a Topps factory, we get to see a little bit of how baseball cards are made. However, most of the video is about how the gum is made.
It seems in 1968 the gum was emphasized more than the baseball cards. Gum is the main product being sold. The baseball cards seemed to be just an extra bonus alongside the gum.