On September 15, 1963 — Inspired by their fans, the Mets hold the first of many Banner Days. The Polo Grounds event gives the ‘New Breed’ an opportunity to display their creative ideas with signs, including some with a negative tone, with a parade on the field between games of a doubleheader against the Colt .45s.

 


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Sources:
Baseball Reference September 15
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game