I guess I should show you a few examples of mirrored plaques designed for fairy lamps. They come in a variety of sizes with one ore more fairy lamps. (I ahve seen as many as six on a mirrored plaque.) Some have brass rings to support the lamp amd others has glass epergne-like arms. It you look carefully at the ring, it is round on the outside and flat on the inside. This is typical of Clarke's designs.
(http://www.fairy-lamp.com/Temp/Plaques.jpg)
The rings come in two sizes, Fairy (approx. 3"d.) and Pyramid (approx. 2"d.) All are stamped "Clarke" on the inside.
Jim.