Dwight, I looked carefully at the photos but can't really tell. It appears that part of the shelf has been corroded away. Perhaps the owner will look to see if the shelf is still intact and if there is a hole where the rivet would have been. The photo below shows a Luger from which the sear safety has been removed. The hole on the right is where the rivet was. It is located where the shelf begins its taper back into the frame.
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