My parents found these in my deceased uncle's garage without any useful accompanying information. He was a bit of a hoarder, but usually of only free things, not known for purchasing antiques
Solved by @Davel23@fedia.io Swing arm curtain rods
Ah, that's a good point. I noticed those at the top as well. He did live in an old house, I can imagine them on each side of a window or something