I don't believe I attended any large banquet in the 1950's that was not photographed with a banquet camera. Some as small as the 5x12, some were 7x17 and of course the indomitable 12x20 and 8x20.
The 7x17 I use was last use before I got it was in 1961 as evidenced by the negative in the contact printing frame included in the kit.