The current NFL no longer recognizes those championships.
This is totally not true...sounds like your inferiority complex is showing! This is from the NFL's own website, it mentions the Cleveland Browns and their championships often...
1951
The Pro Bowl game, dormant since 1942, was revived under a new format matching the all-stars of each conference at the Los Angeles Memorial Coliseum. The American Conference defeated the National Conference 28-27, January 14.
Abraham Watner returned the Baltimore franchise and its player contracts back to the NFL for $50,000. Baltimore's former players were made available for drafting at the same time as college players, January 18.
A rule was passed that no tackle, guard, or center would be eligible to catch a forward pass, January 18.
The Rams reversed their television policy and televised only road games.
The NFL Championship Game was televised coast-to-coast for the first time, December 23. The DuMont Network paid $75,000 for the rights to the game, in which the Rams defeated the Browns 24-17.
1952
Ted Collins sold the New York Yanks' franchise back to the NFL, January 19. A new franchise was awarded to a group in Dallas after it purchased the assets of the Yanks, January 24. The new Texans went 1-11, with the owners turning the franchise back to the league in midseason. For the last five games of the season, the commissioner's office operated the Texans as a road team, using Hershey, Pennsylvania, as a home base. At the end of the season the franchise was canceled, the last time an NFL team failed.
The Pittsburgh Steelers abandoned the Single-Wing for the T-formation, the last pro team to do so.
The Detroit Lions won their first NFL championship in 17 years, defeating the Browns 17-7 in the title game, December 28.
1953
A Baltimore group headed by Carroll Rosenbloom was granted a franchise and was awarded the holdings of the defunct Dallas organization, January 23. The team, named the Colts, put together the largest trade in league history, acquiring 10 players from Cleveland in exchange for five.
The names of the American and National conferences were changed to the Eastern and Western conferences, January 24.
Jim Thorpe died, March 28.
Mickey McBride, founder of the Cleveland Browns, sold the franchise to a syndicate headed by Dave R. Jones, June 10.
The NFL policy of blacking out home games was upheld by Judge Allan K. Grim of the U.S. District Court in Philadelphia, November 12. The Lions again defeated the Browns in the NFL Championship Game, winning 17-16, December 27
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1954
The Canadian Football League began a series of raids on NFL teams, signing quarterback Eddie LeBaron and defensive end Gene Brito of Washington and defensive tackle Arnie Weinmeister of the Giants, among others.
Fullback Joe Perry of the 49ers became the first player in league history to gain 1,000 yards rushing in consecutive seasons.
Cleveland defeated Detroit 56-10 in the NFL Championship Game, December 26.
1955
The sudden-death overtime rule was used for the first time in a pre- season game between the Rams and Giants at Portland, Oregon, August 28. The Rams won 23-17 three minutes into overtime.
A rule change declared the ball dead immediately if the ball carrier touched the ground with any part of his body except his hands or feet while in the grasp of an opponent.
The Baltimore Colts made an 80-cent phone call to Johnny Unitas and signed him as a free agent. Another quarterback, Otto Graham, played his last game as the Browns defeated the Rams 38-14 in the NFL Championship Game, December 26. Graham had quarterbacked the Browns to 10 championship-game appearances in 10 years.
NBC replaced DuMont as the network for the title game, paying a rights fee of $100,000.
1956
The NFL Players Association was founded.
Grabbing an opponent's facemask (other than the ball carrier) was made illegal. Using radio receivers to communicate with players on the field was prohibited. A natural leather ball with white end stripes replaced the white ball with black stripes for night games.
The Giants moved from the Polo Grounds to Yankee Stadium.
Halas retired as coach of the Bears, and was replaced by Paddy Driscoll.
CBS became the first network to broadcast some NFL regular-season games to selected television markets across the nation.
The Giants routed the Bears 47-7 in the NFL Championship Game, December 30.
1957
Pete Rozelle was named general manager of the Rams. Anthony J. Morabito, founder and co-owner of the 49ers, died of a heart attack during a game against the Bears at Kezar Stadium, October 28. An NFL-record crowd of 102,368 saw the 49ers-Rams game at the Los Angeles Memorial Coliseum, November 10.
The Lions came from 20 points down to post a 31-27 playoff victory over the 49ers, December 22. Detroit defeated Cleveland 59-14 in the NFL Championship Game, December 29.
1958
The bonus selection in the draft was eliminated, January 29. The last selection was quarterback King Hill of Rice by the Chicago Cardinals. Halas reinstated himself as coach of the Bears.
Jim Brown of Cleveland gained an NFL-record 1,527 yards rushing. In a divisional playoff game, the Giants held Brown to eight yards and defeated Cleveland 10-0.
Baltimore, coached by Weeb Ewbank, defeated the Giants 23-17 in the first sudden-death overtime in an NFL Championship Game, December 28. The game ended when Colts fullback Alan Ameche scored on a one-yard touchdown run after 8:15 of overtime.
1959
Vince Lombardi was named head coach of the Green Bay Packers, January 28. Tim Mara, the co-founder of the Giants, died, February 17.
Lamar Hunt of Dallas announced his intentions to form a second pro football league. The first meeting was held in Chicago, August 14, and consisted of Hunt representing Dallas; Bob Howsam, Denver; K.S. (Bud) Adams, Houston; Barron Hilton, Los Angeles; Max Winter and Bill Boyer, Minneapolis; and Harry Wismer, New York City. They made plans to begin play in 1960.
The new league was named the American Football League, August 22. Buffalo, owned by Ralph Wilson, became the seventh franchise, October 28. Boston, owned by William H. Sullivan, became the eighth team, November 22. The first AFL draft, lasting 33 rounds, was held, November 22. Joe Foss was named AFL Commissioner, November 30. An additional draft of 20 rounds was held by the AFL, December 2.
NFL Commissioner Bert Bell died of a heart attack suffered at Franklin Field, Philadelphia, during the last two minutes of a game between the Eagles and the Steelers, October 11. Treasurer Austin Gunsel was named president in the office of the commissioner, October 14.
The Colts again defeated the Giants in the NFL Championship Game, 31-16, December 27.
1960
Pete Rozelle was elected NFL Commissioner as a compromise choice on the twenty-third ballot, January 26. Rozelle moved the league offices to New York City.
Hunt was elected AFL president for 1960, January 26. Minneapolis withdrew from the AFL, January 27, and the same ownership was given an NFL franchise for Minnesota (to start in 1961), January 28. Dallas received an NFL franchise for 1960, January 28. Oakland received an AFL franchise, January 30.
The AFL adopted the two-point option on points after touchdown, January 28. A no-tampering verbal pact, relative to players' contracts, was agreed to between the NFL and AFL, February 9. The NFL owners voted to allow the transfer of the Chicago Cardinals to St. Louis, March 13.
The AFL signed a five-year television contract with ABC, June 9. The Boston Patriots defeated the Buffalo Bills 28-7 before 16,000 at Buffalo in the first AFL preseason game, July 30. The Denver Broncos defeated the Patriots 13-10 before 21,597 at Boston in the first AFL regular-season game, September 9.
Philadelphia defeated Green Bay 17-13 in the NFL Championship Game, December 26.
Sandra