Here at the store, we called these guys “fat bellies.” Even though they measure the standard 2 1/4 inches across, the shape of the knob gives the appearance of a fat belly. This set is of the Art Deco era, with a circle pattern. The top has the indented grove, which is darker (painted?) that contrasts with the brass, but gives the circle effect so popular of the day.
The knobs are heavy brass, including the necks. There is a slight dimple in one knob, not real noticeable. We have only lightly cleaned these, no polishing. They maintain the aged patina. A spindle and two set screws are included.