"FC" first and most immediately suggests "football club," meaning soccer -- the abbreviation is ubiquitous among soccer teams. The article Shawn posted mentions Keystone AA -- surely "Athletic Association." It was fairly common way back when for men's clubs, youth clubs, &c', to field teams in several sports, often with the same amateur athletes. Maybe this group was first formed as a soccer club, then dabbled successfully in baseball and perhaps other sports as well.
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