I replaced an old light fixture on the landing going to our basement and found this behind the base of the fixture. Obviously, when one of the previous owners removed the wallpaper, they took the quick'n'easy way out and didn't remove the light fixture.
This must be vintage 70s stuff. The black has a velvety feel to it. Considering the basement walls have wood paneling on them (now painted) I have to assume that the main floor of our house was covered with this stuff at one point. A small piece of history to our home. :)