Strap buttons................you have the shape more or less right, but the shaft at the end is wrong.
The bit you see on the guitar is the whole thing, but it is drilled out to allow for a screw that secures it to the guitar body.

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All the Woes of a World by Jonathan Icknield aka The Bryster

And in my final hours - I would cling rather to the tattooed hand of kindness - than the unblemished hand of hate...