.... "Athletic Club" yes, or if just "AC", it could stand for Atlanta Cubs (ha,ha). Even if the letter "B" was on the uniform and it once read "ABC", it could just stand for Arkansas Baptist College, or another HBCU. Without another player PC to compare it, any markings, or correspondence on the back it's near impossible. It's fun to ponder, and no one is hurt by offering reasonable theories. Great looking PC.