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Does anyone know what this is?
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Ah cool thanks! Do you know what the cutout mates up with? I see in your screenshots that they're all keyed various ways, I'm guessing they went into some kind of punch machine or something along those lines?
Edit: best I found is from here: https://patents.google.com/patent/US1859307
Makes it sound like there was a sort of rail that matched the cutout to mistake proof putting one person's tagged clothes bags back together after they were laundered.
Good find. I kept noticing different patent numbers on them and was a little confused, since the safety pin has its own patent and was created before these things. To further my confusion, I also found this page which shows a key attached to the pin.
Very interesting rabbit hole!