From what I gather, the Junior Sales Club of America was designed for Kids to sell cards (blank, those were the day when people communicated via pen and a stamp) and after so many boxes sold, they got to select a reward.
If you check the circled items, you may (or not) be surprised that they could select as reward Marlin 22 rifles and a Marlin shotgun. Obviously this is pre-GCA68 so that means the guns were shipped directly home to boot.
It explains all those school shootings back then….oh wait.