Vintage metal (vintage patina, some rust, can easily be painted) fence hanging planter hooks. Top pulls up (may need to use some wd 40) and holds the garden pot in place and it can be then hung onto fence. I did a whole container garden back in the 1980's with these along my privacy fence in a little apartment I lived in, alas I only have these 4 left, price is for EACH, I will be glad to combine shipping.
Called the Clinger Clip, patented by Fanon Designs, Atlanta, GA, 1974
Materials: Metal.