Four Roses Blend of Straight Bourbons, 1956

The reason this is called a “blend of straight bourbon whiskeys” is that Seagrams had multiple distilleries, in different states. If it was all distilled in one state it could simply be labeled straight bourbon whiskey, but I imagine this had some bourbon distilled in Kentucky and also some distilled in Indiana, so by regulation it had to be called a blend of straights.