As the NFL began to celebrate milestones over the last two decades, it incorporated the use of old replica uniforms worn during games. These uniforms became known as "throwbacks" and developed into a savvy and successful marketing tool for the league. The first throwbacks were worn as part of the NFL's 75th anniversary season in 1994. In 2009, the NFL introduced a 50th anniversary celebration for franchises that originated in the AFL, prior to the merger of leagues.http://www.jerseysshopcheap.com