WA) The Pilots were originally not scheduled to begin play until 1971 - however the date was moved 2 years ahead in order to keep the number of teams in the league even.
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Mariners to Wear Seattle Pilots Throwback Uniforms – SportsLogos.Net News
Men's Seattle Pilots - #56 Jim Bouton Cool Base Stitched Jersey
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Seattle Mariners unveil new spring training uniforms
Seattle Mariners unveil new spring training uniforms
Lot Detail - 1969 Seattle Pilots Spring Training Game-Used Home Flannel Jersey