When I was in college in NYC, the candy machines in the subway stations were always empty – except for Powerhouse Bars. If you got desperate enough to buy one because it was 3 A.M. or something, you most likely got one with a faded wrapper. Only the Lord himself knows how long they had been in there. That was in the 60s, but the wrappers probably had pictures of people rolling up their sleeves to defeat Hitler.
All kidding aside, some older bars included a rhyming slogan on the wrapper: “Generous. Nutritious. Truly Delicious.” The wrappers on the oldest ones just said “good eating.” Their corporate mascot was named Roger Wilco, and their oldest ads looked like the color comic strips from the Sunday paper.