This base is from a Toronto Blue Jays home game at Exhibition Stadium honouring Jackie Robinson. The base was autographed by Jimy Williams. Williams was the manager of the Toronto Blue Jays from 1986-1989. Jackie Robinson Day has been celebrated in Major League Baseball annually on April 15^e since 2004. Prior to this, there was no set day each year to honour Jackie Robinson. Since this base is from a Jackie Robinson Day game in the late 1980s, it might not have been used on April 15th.