I have a 1954 Williams Colors pinball, and it was basically made as a gambling machine. Drop in a nickel to play a game, or drop in a second nickel to activate the "Star" feature. When your ball drained, it would light up a random number at the top, and if the number matched your last two digits of the score, you were awarded replays. If you matched every time, you could get a couple hundred replays. When game was over, the player would go to the bartender and show him the replays, which would be paid out as cash. Under the machine is a knockoff button which would wipe out the replays.
The machine also has impulse flippers. When you would push a flipper button, it activated both flippers. That way, a person could play the game while holding their beer.