Slideshow of lobby cards from a collection assembled by late screenwriter Leonard Schrader. Here's a companion article about the collection's discovery.
Screenwriter Leonard Schrader's secret collection consisted of lobby cards, which were used to promote films in movie theaters from the silent era through the 1960s. Typically issued as a set of eight sequential 11"-by-14" mini-posters depicting scenes from a film, they pre-dated trailers as a promotional device. They were low tech even by 20s standards, but in a black-and-white era, they made up for it with their flashy graphics, riotous colors, and over-the-top salesmanship.