Apparently the contest continued beyond 1956 (first and second images), because the advertisement that follows is from 1959.
Ann Daly (No. 25) screams as she is declared "Miss Color-TV" in beauty contest at Palisades Amusement Park, N.J.; other contestants stand alongside her.
Category: Awards, Prizes, Competitions and Contests | Beauty, Ugliness and Other Aesthetic Issues | Television | 1950s