I lived across the river from NYC during that time. The machines had a card on them that indicated you had to be at least 16 to play, but I was never questioned. I don’t consider pinball to be gambling, but it is addictive.
Back in the 60s, “Mickey Mouse in a glass house” was sold at parades where I lived. A black balloon in the shape of Mickey Mouse’s head (with the trademark ears) was inside a clear balloon.
A duel AMONG three people. “Between” is used when two people are involved. “Among” is used when more than two people are involved.