Major League Baseball
Major League Baseball team colors
All 3 clubs currently in the dataset, with 5 distinct colour values between them. Founded 1903; the sport is baseball.
Major League Baseball carries the longest unbroken visual traditions in North American sport, and several clubs use colours that have barely shifted in a century. That continuity makes the exact value matter: a near-miss on a heritage colour reads as wrong in a way a newer brand would not.