Help with antique digger wiring / schematics

[reddogrob]

Hello,
I'm trying to restore a digger that looks like a Merchantman but I can't find anything inside identifying it. There is a plug at the lower part of the cabinet that I think may have gone to a coin counting module but it is missing. There must be something else going on in that missing module but I have no idea what the pinout would be. I attempted to make a wiring diagram of what is in this cabinet in the hopes that someone can help me figure out what I'd need to connect to this plug to make things work. I can't find any relevant info online about this mystery module. Thanks in advance for any help.
-Rob