I’m very late to this topic. The unit with the bell is the match unit, it doesn’t have a reset solenoid. Looks like someone taped over the kick out holes because the bottom plastics are broken. What did someone use for rubbers on that thing? Hope someone didn’t seal the back glass with that much dirt on it. The big concern I have are the relays in the base box. One seems to be missing and there may be some coil issues. Some of those relays should have Red coils indicating 120VAC which Williams used for coin relays and some other relays.

Interesting project, playboard and glass are in pretty good shape there are mylars around the pop bumpers that need to go. I’d remove all of the machinery from the top of the play board clean, sand (very carefully) touch up and give it 5 coats of water based Varathane. There is always Pinball Resource for parts.