My Abra Ca Dabra, has the exact green wire grounding as your C37. Those blue crimp connectors are from the 1970's, and are not a standard that Gottlieb used.

Your power cord is missing the cover in that area where the prongs are. For your own peace of mind replace the cord, attaching the ground wire, to the base of the transformer.

Yes it was built for Canada. It doesn't have the cage or door lock out. Only 1 of my EMs has the transformer cage and door lock out switch, and that even was installed at Gottlieb, as all of the wiring is buried in the wire harness and not just laid on top of the harness.

Can post pictures tomorrow afternoon. Or possibly this afternoon. Gottlieb pins that were exported and made to go to Canada have a stamp on the motor board, by the game counter.

It is a safety thing. We do not want people reaching into a live machine and touching a transformer with sweaty fingers.

Those transformer cages can also be found in 70's juke boxes, cigarette machines, and vending machines.

Think that is a Province of Ontario only requirement.

Here are the pics. Showing metal crimp connectors and what appears to be welded studs on the braces for the legs.

Right side rail, right front leg and lock down bar receiver.
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Left side rail, they replaced a nail, with a long bolt through the side of the cabinet
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Rear legs.
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Some one took some time to do this, or had done it many times before.

I have my doubts that this grounding wire set up is a factory option. From the ones I have seen all the wiring looks to be added.

The scenario would be a company importing new machines for re-sale in Ontario. The Provincial gov't would only allow commercial electric equipment in to Ontario unless it could pass a CSA test. There are no UL or CSA labels on 1970's Gottliebs.

On a smaller scale, what if the City of Toronto tried to control the amount of pins were in the city by making the operators jump hoops to licence the games. With that the games had to pass any testing by the CSA? With various grounding and that isolation transformer modifications? (Just a wild guess).

So I should question my self when I want to use this 1915 Universal Toaster, with a 2 prong cloth cord?

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That 3 wire cord in this You Tube video is one of those cords were the wires are flat. The ground wire wasn't even connected. Should change it to a round 3 wire cord, hopefully in black, that would look more original.

Just a personal preference to me. That wide looking flat 3 wire cord, in that video looked modern. A round cord is not original, the flat 2 wire cord is. Like seeing a yellow extension cord installed into a pin, it will work, but it stands out.