This set is quite unusual. We are guessing that this family of pulls (all originally together), came off of a small piece of furniture such as a spool cabinet. We have nothing else like it. From the style and shape of these little ones, we are labeling the set as Art Deco, from out of the 1920s or 1930s.
Each brass pull is thin and small. Then, to add to its uniqueness, the pull is secured to the surface with two screws, only 1/2 inch apart from center to center! Each pull (or knob, if you prefer) is 2 1/4 inches long but only 7/16 inch wide. The pull is all one piece, that was made with a tapered neck, as you can see in the picture. The base that sits next to the wood is one inch by 3/8 inch.