So, there is no definitive answer to how many bingo machines Bally produced. The IPDB has a few numbers listed, but they seem stupid low for the most part. For instance, they indicate 450 Show Time games were manufactured. If that's the case, somehow I've ended up owning almost 3% of the games ever made. So that number is completely phony. I don't have any idea where those IPDB numbers come from.
Danny has his serial number page up at http://danny.cdyn.com/serialnumbers.htm. I need to give him my numbers so he can get them in the list. I encourage anyone to do the same.
In the March 30 1963 issue of Billboard, page 53, Bally says they had manufactured "hundreds of thousands of busy Bally bingo games". I wish we knew for sure if that was hype, it would be interesting.