On September 22, 1966 — The Orioles clinched their first pennant representing Baltimore when Jim Palmer goes the distance, beating Lew Krausse and the A’s at Municipal Stadium, 6-1. The franchise’s last flag was raised in St. Louis in 1944 when the team was known as the Browns.
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Sources:
Baseball Reference September 22
National Pastime September 22
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game