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Evidence that it is indeed the "World" Series, this Japanese poster advertising the 1926 Fall Classic features Japanese writing on the left margin describing the scene shown. The picture comes from the second game of the 1926 World Series, New York Yankees vs. St. Louis Cardinals, won by the Redbirds in seven games.
Other past auction items that may be of interest to you.
November 2010 Catalog
June 2011 Catalog