On September 9, 1979 — When Bob Montgomery takes his final at-bat, he becomes the last player to step into the batter’s box without wearing a helmet. The Red Sox’s backup catcher, who is required to wear a protective plastic liner within his cap, is allowed to be helmetless due to a grandfather clause in Major League Baseball’s edict enacted eight years ago, making the use of helmets mandatory for all batters.

 


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Sources:
Baseball Reference September 9
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game