This is from the 89 Earthquake Battle for the Bay series which was between the SF Giants and the Oakland A's.
1989 Nike Will Clark Mark McGwire Battle of the Bay World Series Poster FRAMED
A's fans hope to unite with Giants fans to protest Fisher's Vegas plan
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1989 MLB Battle of The Bay World Series Poster, SF Giants, Oakland A's
Magic by the Bay: How the Oakland Athletics and the San Francisco Giants Captured the Baseball World [Book]
A's fans' fight to keep the team in Oakland hits the road: 'It's
Oakland Athletics Posters for Sale - Fine Art America
2022 Cal Poly Baseball Team Information Guide by Cal Poly
1989 Nike Will Clark Mark McGwire Battle of the Bay World Series
Giants look to snap skid in Bay Bridge Series against Athletics
1989 World Series, Baseball Wiki
Battle of the Bay: A's fans seek support from Giants fans against
Oakland Athletics 4.5 x 3.5 Battle of The Bay 1989 World Series Patch