(*) Because the NFL did not count tied games in league standings until... - dofaq.co
history of the national football league championship

(*) Because the NFL did not count tied games in league standings until...

wikipedia - 04 Feb 2019
(*) Because the NFL did not count tied games in league standings until 1972 (when ties were added to past standings retroactively), these seasons were considered to be "perfect" at the time they finished. Because the rules existing at the times of those championships did not give the teams involved any incentive to avoid tie games in order to maintain a "perfect" season, the accuracy of calling these seasons "imperfect" is still disputed.
history of the national football league championship

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American Football International - 19 Aug 2019
The 2019 NFL season will be a historical one for many reasons. First, this will be the 100th season of the National Football League. The centennial year will ...

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