... both before and after the AFL/NFL merger, perfection has been hard to come by.

In fact, from 1920 until the AFL/NFL merger in 1970, the Chicago Bears were the only team to finish with an unblemished regular season record, a feat they pulled off twice; once in 1934 and again in 1942.

Ultimately though, it was all for naught as they lost both championship games; the first to the New York Giants, the second to the Washington Redskins.

Since 1970, only two teams have managed to complete the regular season with an undefeated, unt...

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