Jimmy Key played his entire career in the American League East, dividing between three teams, Toronto, New York, and Baltimore, finding success with all three clubs.
Claude Passeau appeared in one game in 1935 for the Pittsburgh Pirates, and the three innings he had shown nothing that would make you think he would be a future All-Star.
Frank McCormick debuted for the Cincinnati Reds in 1934, and this was the team that he had his greatest success by far.
One of the most underrated players in Baseball's history has to be George Uhle, a Pitcher who spent most of his career with the Cleveland Indians and won an even 200 Games.