This is NFL Films - Season 2 Episode 3 : Inside the Vault, Vol. III: Merger (1970) 2016

Classic NFL Films footage and behind-the-scenes action, straight from the Vaults of NFL Films. Features rarely seen footage of the early days of pro football in America, from the unique perspective of NFL Films. Volume 3: Merger (1970). This volume focuses on the merger between the National Football League and the American Football League. Based on nearly 400 hours of lost footage re-creates the rocky honeymoon and successful marriage of the two Leagues.