the ppm has a few pretty ratty 1950's bally and united bingos that are scheduled for the part-out piles.
if you are in the San Francisco bay area and always wanted to try working on a bingo, these are pretty much free (or anything you'd care to donate) - no legs tho.
the ones I remember are:
United: circus, triple play, manhattan (maybe), ...
Bally: night club, big time, a magic screen game, cypress gardens, ...
I'll get a better list next week.
backglass conditions are probably mostly poor. Any good ones the ppm would look to sell.
I will be digging into a couple of machines to document stuff that wasn't in the manual, but if someone wanted the game I'd do it non-destructively. It's faster to chop them up, so that's the plan over the next few months.