Martin J. Sheridan advertisement for A.G. Spalding & Brothers athletic equipment. All three world champions mentioned in this ad; Martin J. Sheridan, John Flanagan and Pat McDonald, were members of the Irish-American Athletic Club.
Source: “Irish Americans in Sports: The Twentieth Century” by Larry McCarthy, from Making the Irish American: History and Heritage of the Irish in the United States. Published by NYU, Glucksman Ireland House Archives.