Maybe not as unknown as some, but Lefty O'Doul is not a name you hear very often outside of San Francisco. Lefty was an incredible hitter and baseball presence for close to 50 years. He is beloved in Japan due to his persistence in expanding the game there. He led the league in hitting twice after flaming out as a dead arm pitcher: hitting 398 in 1929 and 368 in 1932. In parts of 11 seasons he batted 349 for his career.
Here he is as part of a 1941 San Francisco Seals stamp album:
