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The 1948 Cleveland Browns finished 15-0 in the All-American Football Conference, which disbanded two years later. The AAFC's records are not acknowledged by the NFL.

Several NFL teams in the 1920's and 1930's finished their seasons without a loss, but had at least one tie on their season ending record.

The only Superbowl-era NFL team to complete a perfect season is the 1972 Miami Dolphins, who defeated the Washington Redskins 14-7 in Super Bowl VII to finish with a 17-0 record.

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