Letter Box is an Australian television series which aired in 1962 on what would eventually become the Seven Network. It was a game show in which contestants tried to build words using a series of letters supplied by the host.
The series was hosted by Bill Acfield, who was assisted by Myra Roper. It aired in a 30-minute time-slot (running time excluding commercials is not known), in black-and-white.
It was followed-up the following year with Party Time.
References
Letter Box (TV series) Wikipedia(Text) CC BY-SA