For Big Four, I would include Cracker Jack (both '14 and '15 since they are pretty similar). Maybe Cracker Jack would already be considered one of the Big sets if they were more accessible/common. The other Big 3 sets have large Populations.
Runner ups would be '53 Bowman (trailblazing full color with actual, gorgeous pictures) and '55 Topps (first major horizontal, and it has some important rookies including Clemente and Koufax).
|