Great point... A bigger/clearer scan of the reverse would reveal a lot.
I think I see a recessed area where the curved pinback might fit in. If so, the pin portion does look to be a replacement, as it doesn't match the wear/corrosion of the "Button" portion. But the reverse scan is such a blurry mess, that it's to hard to tell. To Lance's point, it also appears possible that another pin (or attaching device) has long since become detached from the center.
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