Thanks OP for a great question.
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Just going to throw this out there. Many plugs from the seventys had no wider blades to make sure hot was where it was supposed to be. The cord I just replaced on a 1970 Gottlieb was like this. I have another the same way.
With plugs like these, some people call them "lamp cords" it wouldnt matter how you wired the pin as you are rolling the dice every time you plug it in, as plug can go either way.
Obviously the transformer doesnt care? Works either way?
Not suggesting this is true for all pins.
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