The first time Pittsburgh and Green Bay played each other was the first year the NFL legalized the forward pass from anywhere behind the line of scrimmage.
Hashmarks were new, too.
Ten teams existed, none of them west of Green Bay.
Multiple divisions were a new concept. And a season-ending championship game, which had happened by chance the year before when two teams tied in the final standings, was scheduled before the season for the first time.
The franchise fee to join the 13-year-old league was $2,500. Pittsburgh owner Art Rooney paid his way in with money he won on horse racing. But first, he had to get Pennsylvania to relax its blue laws prohibiting sporting events, including the NFL, from taking place on Sundays.
Rooney's team wouldn't be known as the Steelers for another seven years. Hoping to piggyback baseball's popularity, Rooney simply took the name of Pittsburgh's major league franchise, the Pirates.
"That was common among NFL teams at the time," said Joe Horrigan, Pro Football Hall of Fame vice president of communications/exhibits. "The Brooklyn Dodgers, Cleveland Indians, Cincinnati Reds, New York Yankees. NFL teams liked to have people think they were affiliated with the baseball teams, even though they weren't. And the baseball teams didn't seem to mind."
The NFL has come a long way since that pivotal 1933 season. On Sunday, a record crowd of more than 105,000 fans will pack Cowboys Stadium in Arlington, Texas, for Super Bowl XLV.