ESPN.com's Uni Watch looked at some of the memorable helmet changes in NFL history. It brought back memories for me.As a cub Bay Area reporter in 1991, I went to a news conference arranged by the San Francisco 49ers. It was an elaborate affair with catered food. In sportswriter's terms: it was a big deal.The reason?To announce the change of the team's helmet. The classic "SF" was changed to highlight the "49ers" part of the name.