Thinking maybe it is or was an IGT S+, at least that's what the id plate model number came up as. I don't think mounting the mpu board to a piece of wood is something IGT would do to a production model. Maybe it is a prototype or someone created their own slot. That white pvc coin chute is also something DIY.
Might have used home-made slot tickets they printed themselves that the BV could read, so people could play. Players could make a donation to a charity and get a handful of gaming tickets. Or they'd play with real $1 & $5 bills, then receive winnings on tickets they could redeem for prizes. It looks so clean and shiny, like it isn't very old or wasn't played much.
Interesting...
Perhaps it is from the local Knights of Columbus hall, was used on Bingo & Casino night.