Episode 231 - 1953 Bally Yacht Club - a podcast by Nicholas Baldridge

Bally's Yacht Club used a mechanism that was not used in any other bingo!
The numbers on the backbox are arranged in a 9x5 grid.  By default, the second through the sixth column of numbers are surrounded by a yellow border.  This is the card you are playing for.
If you earn the feature, you can move those yellow lines to surround a different set of 5x5 numbers!  This changes the makeup of each row as you move the surrounds.
In my mind this is the precursor to the Magic Screen - just less expensive!
It was likely confusing for new players, which may have been why it was never used again.

Further episodes of For Amusement Only EM and Bingo Pinball Podcast

Further podcasts by Nicholas Baldridge

Website of Nicholas Baldridge