Stem of a candelabrum in three heights

The object consists of a wrought iron rod, an iron split pin, and the following cast and turned parts of yellow copper: the hanging ring, three stem parts, the ball, and the knob. The upper stem part, decorated with grooved rings, is largely tubular and has a thickening at the bottom. The tube has two ribs interrupted by four notches each. These notches are unmarked at the top, or marked with one, two, or three punched dots.