1971 Topps Football packs included a game complete with playing field. I don't recall how the various inserts were distributed.
These posters came folded with the cards. When opened they are about 6-3/4" X 4-3/4".
The back of the poster has instructions for playing the game, a scoreboard, and a football field to play the game on.
This is another insert used, when cut in half, to be the ball marker and first down chains.
Stay tuned. Tomorrow I'll show you some of the game cards.