If it hasn't become apparent, the tabs with the club names on can be slotted into any position enabling you to keep up to date league tables.
As mentioned, the sets came with football magazines, although I can't recall if they were given away.
The design is based on an office system - the name of which I can't recall - which had bigger cards slotted into a metal grid mounted on a wall.
The cards were plain or ruled, the idea being the user would write stuff on them.
Various uses, including stock control and recording the progress of orders.