Hi EM-PINMAN
I guess many pinsiders would like to help - but when I / we do not have the pin ...
Your pictures show the bottom-board taken-out of the pin - If it would be in the pin I then would advise: Manually actuate the relay and look what reaction the pin shows --- then looking up in the (ipdb) schematics what switches / relays are involved.
We can use the ipdb-schematics - left of "No-1-Relay" there is the "Knock-Off-Switch" mounted on the board - wire-orange-grey. According to the schematics this wire runs to "Coil on Lock-Relay". Follow this wire-orange-gray - does the wire ends at "No-1-Relay" ? IF (if) Yes: "No-1-Relay IS the Lock-Relay.
The "No-8-Relay" has a thing attached - "Lectrohm 500" --- in the schematics I see "Change-Relay" has an 500 OHM resistor mounted - "No-8-Relay" is the "Change-Relay".
To the right of the "No-8-Relay" You show the "25 Cent Relay" - the schematics tells me: "IT IS OPERATED by 110 VAC, coil has soldered-on WIRE-a-90-color-GREY.
I believe to see Wire-color-GREY also at the "Coil on No-5-Relay" - the wrapping paper says "Z-3?-4200" - the "110VAC driven COIN-Relay" is marked as "Z-35-4200", its other wire (schematics) has wire-color-B-31-2-Yellow-Red - this does NOT match with (JPG, picture) wire-blueish. The schematics tells me: wire-Yellow-Red leads to "Self-Hold-Switch on the COIN-Relay" - my question: when You follow the "wire-blueish" - do You come to "Switch-mounted on COIN-Relay" and THERE at the same solder-lug is "wire-Yellow-Red" and it connects to "Switch on Lock-Relay".
"No-7-Relay" has a wrapping paper "Z-27-1000" - a wire runs from the Coil to "Self-Hold-Switch mounted on the relay" - wire-color-somewhat dark - question: Is on that solder-lug another wire-color-??? soldered-on ? what color ?
There are only a few relays in the schematics marked as "Z-27-1000" - we may find the relay in the schematic - looking at wires-colors of wires osed on the switches of this relay.
So I guess: "No-1-Relay" is Lock-Relay, "No-8-Relay" is "Change-Relay" "No-5-Relay is Coin-Relay", greetings Rolf