In addition to standard sizes of movie posters, movie
studios would sometimes issue lobby cards
in other sizes, which the studios sometimes referred to as "color
panels." These would normally vary in size anywhere from 16"
x 20" to 18" x 24".
For example, for the film Clash of the
Titans, MGM Studios issued a set of six cards measuring 18" x 23"
that were included in their deluxe campaign kit.