The beautiful Yankee Pennant (from 1976) also marks the first time I was in New York, and hence my first time in the new Yankee Stadium, watching the game from along the 3rd base line a few rows up. I vividly remember the Bronx, and the drive there, and the graffiti on the subway cars and the kids playing in the water gushing from open fire hydrants (it was a very hot July) -- and also, near my relatives in Bay Ridge Brooklyn, the Disco 2000 where they filmed Saturday Night Fever (that came out in, I think '77).
Amazing what a collection -- even someone else's -- can bring to mind.