Did you know that the Seattle Pilots became the American League Milwaukee Brewers (click for their managers) in 1970 who in turn became the first American League team to switch to the National League (it was in 1998)?
During the 1969 season — their first & only season — the Seattle Pilots had their largest attendance when 677,944 fans attended home games where they were able to see and witness the team's first & only logo:

Seattle Pilots Logo
On April 11, 1969, the Seattle Pilots had their only Opening Day game in history and 14,993 fans watched them play the Chicago White Sox.