Lacking any dimensions I inserted the photo into Microsoft Powerpoint and used the grid lines to measure it. The round spiral alone is 2" wide by 3" tall. The hollow stem is 5/8" OD, so that's about right for 1/2" ID. Having not been threaded perhaps is used solder or an interference fit to hold it in place. ID would awfully small for the head of a staff. Remembering the shape of harness haimes, I can't think what they would fasten to and I think would bounce off.
I'm going with curtain rod tip. The eye could be used to hang a tassel from.