1877 – After St. Louis C John Clapp has his cheek smashed by a foul tip‚ replacement Mike Dorgan goes behind the plate wearing a mask. Though used earlier in the International Association‚ this is perhaps the first use of a catcher’s mask in an official National League game.

On August 8, 1877 — 1877 – After St. Louis C John Clapp has his cheek smashed by a foul tip‚ replacement Mike Dorgan goes behind the plate wearing a mask. Though used earlier in the International Association‚ this is perhaps the first use of a catcher’s mask in an official National League game.

Source:
Baseball Reference August 8
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game