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Joe_G.By 1888, it was the International Association, not League. The 1888 Association didn't carry-over the laws the League passed in 1887 which forbade new contracts to colored players (the International League split in half at the conclusion of 1887 with 4 teams joining the new 1888 Association).
I suspect the two black players are Moses Fleetwood Walker & Robert Jiggins, both accomplished players. Moses would be the last colored player in the league, playing until at least July 1889. This is my best guess based on limited research.
Neat photo, will be fun to watch it in REA.
Best Regards,
Joe Gonsowski