Thanks for posting the links!
Some of the "horsey" ganes from Williams are quite collectible... Especially the woodrail ones with backbox animations.
I've been looking for a NAGS but no luck here
As for the auction itself, I got a 1937 Bally Booster from one of these auctions a few years ago. It's a beautiful machine and has a special place of honour in my office. That being said, I know the seller had a professional tech look at the machine before it went up for bidding. I expect most machines found here would have some sort of issue for sure.