Starter relay conundrum

Wow. I’m impressed, I expected to get pages of wrong guesses!
Thank you. I went out back at 12:20 to get the relay from the truck…
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Now under better lighting and reading glasses for a better look-see…

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I now see that grounding plate.
I thought that it might have had a spade on it that broke off but it looks so cruddy, it wasn’t likely. Now looking closer, it looks untouched, maybe original?
Kooky.
Thanks again!