Reginald “Reggie” Martinez Jackson, born on May 18, 1946, Wyncote, Pa., got the nickname “Mr. October” for his record made in World Series games played with the New York Yankees and California Angels. He was the first player to accumulate 10 home runs in 27 Fall Classic games. Reggie Jackson was the first player in Major League history to collect more than 100 home runs for more than three baseball clubs.
Information retrieved from: www.baseballhalloffame.org